diff --git a/apps/openmw/mwbase/windowmanager.hpp b/apps/openmw/mwbase/windowmanager.hpp
index c252e0c490..9e8cb05d34 100644
--- a/apps/openmw/mwbase/windowmanager.hpp
+++ b/apps/openmw/mwbase/windowmanager.hpp
@@ -290,7 +290,7 @@ namespace MWBase
 
         virtual void setEnemy(const MWWorld::Ptr& enemy) = 0;
 
-        virtual int getMessagesCount() const = 0;
+        virtual std::size_t getMessagesCount() const = 0;
 
         virtual const Translation::Storage& getTranslationDataStorage() const = 0;
 
diff --git a/apps/openmw/mwgui/keyboardnavigation.cpp b/apps/openmw/mwgui/keyboardnavigation.cpp
index 85c7d8ba88..d46a88e580 100644
--- a/apps/openmw/mwgui/keyboardnavigation.cpp
+++ b/apps/openmw/mwgui/keyboardnavigation.cpp
@@ -246,12 +246,12 @@ namespace MWGui
 
         bool forward = (direction == D_Next || direction == D_Right || direction == D_Down);
 
-        int index = found - keyFocusList.begin();
+        auto index = found - keyFocusList.begin();
         index = forward ? (index + 1) : (index - 1);
         if (wrap)
             index = (index + keyFocusList.size()) % keyFocusList.size();
         else
-            index = std::clamp<int>(index, 0, keyFocusList.size() - 1);
+            index = std::clamp<decltype(index)>(index, 0, keyFocusList.size() - 1);
 
         MyGUI::Widget* next = keyFocusList[index];
         int vertdiff = next->getTop() - focus->getTop();
diff --git a/apps/openmw/mwgui/messagebox.cpp b/apps/openmw/mwgui/messagebox.cpp
index b27adacd0f..1d6e1511c4 100644
--- a/apps/openmw/mwgui/messagebox.cpp
+++ b/apps/openmw/mwgui/messagebox.cpp
@@ -28,7 +28,7 @@ namespace MWGui
         MessageBoxManager::clear();
     }
 
-    int MessageBoxManager::getMessagesCount()
+    std::size_t MessageBoxManager::getMessagesCount()
     {
         return mMessageBoxes.size();
     }
diff --git a/apps/openmw/mwgui/messagebox.hpp b/apps/openmw/mwgui/messagebox.hpp
index bb61bd6bd9..feb717e0ad 100644
--- a/apps/openmw/mwgui/messagebox.hpp
+++ b/apps/openmw/mwgui/messagebox.hpp
@@ -29,7 +29,7 @@ namespace MWGui
             bool immediate = false, int defaultFocus = -1);
         bool isInteractiveMessageBox();
 
-        int getMessagesCount();
+        std::size_t getMessagesCount();
 
         const InteractiveMessageBox* getInteractiveMessageBox() const { return mInterMessageBoxe.get(); }
 
diff --git a/apps/openmw/mwgui/screenfader.cpp b/apps/openmw/mwgui/screenfader.cpp
index e22517a360..22c6a803f2 100644
--- a/apps/openmw/mwgui/screenfader.cpp
+++ b/apps/openmw/mwgui/screenfader.cpp
@@ -97,8 +97,8 @@ namespace MWGui
             imageBox->setImageTexture(texturePath);
             const MyGUI::IntSize imageSize = imageBox->getImageSize();
             imageBox->setImageCoord(
-                MyGUI::IntCoord(texCoordOverride.left * imageSize.width, texCoordOverride.top * imageSize.height,
-                    texCoordOverride.width * imageSize.width, texCoordOverride.height * imageSize.height));
+                MyGUI::IntCoord(static_cast<int>(texCoordOverride.left * imageSize.width), static_cast<int>(texCoordOverride.top * imageSize.height),
+                    static_cast<int>(texCoordOverride.width * imageSize.width), static_cast<int>(texCoordOverride.height * imageSize.height)));
         }
     }
 
diff --git a/apps/openmw/mwgui/trainingwindow.cpp b/apps/openmw/mwgui/trainingwindow.cpp
index fa4fd266b5..890aa0ba68 100644
--- a/apps/openmw/mwgui/trainingwindow.cpp
+++ b/apps/openmw/mwgui/trainingwindow.cpp
@@ -189,8 +189,8 @@ namespace MWGui
         mProgressBar.setProgress(0, 2);
         mTimeAdvancer.run(2);
 
-        MWBase::Environment::get().getWindowManager()->fadeScreenOut(0.2);
-        MWBase::Environment::get().getWindowManager()->fadeScreenIn(0.2, false, 0.2);
+        MWBase::Environment::get().getWindowManager()->fadeScreenOut(0.2f);
+        MWBase::Environment::get().getWindowManager()->fadeScreenIn(0.2f, false, 0.2f);
     }
 
     void TrainingWindow::onTrainingProgressChanged(int cur, int total)
diff --git a/apps/openmw/mwgui/windowmanagerimp.cpp b/apps/openmw/mwgui/windowmanagerimp.cpp
index 29b9cb0e84..4678a269e1 100644
--- a/apps/openmw/mwgui/windowmanagerimp.cpp
+++ b/apps/openmw/mwgui/windowmanagerimp.cpp
@@ -1685,9 +1685,9 @@ namespace MWGui
         mHud->setEnemy(enemy);
     }
 
-    int WindowManager::getMessagesCount() const
+    std::size_t WindowManager::getMessagesCount() const
     {
-        int count = 0;
+        std::size_t count = 0;
         if (mMessageBoxManager)
             count = mMessageBoxManager->getMessagesCount();
 
diff --git a/apps/openmw/mwgui/windowmanagerimp.hpp b/apps/openmw/mwgui/windowmanagerimp.hpp
index 3445ebdb9a..617570b336 100644
--- a/apps/openmw/mwgui/windowmanagerimp.hpp
+++ b/apps/openmw/mwgui/windowmanagerimp.hpp
@@ -313,7 +313,7 @@ namespace MWGui
 
         void setEnemy(const MWWorld::Ptr& enemy) override;
 
-        int getMessagesCount() const override;
+        std::size_t getMessagesCount() const override;
 
         const Translation::Storage& getTranslationDataStorage() const override;
 
diff --git a/apps/openmw/mwinput/bindingsmanager.cpp b/apps/openmw/mwinput/bindingsmanager.cpp
index 3f505896f4..a6bab19673 100644
--- a/apps/openmw/mwinput/bindingsmanager.cpp
+++ b/apps/openmw/mwinput/bindingsmanager.cpp
@@ -627,12 +627,12 @@ namespace MWInput
         return mInputBinder->detectingBindingState();
     }
 
-    void BindingsManager::mousePressed(const SDL_MouseButtonEvent& arg, int deviceID)
+    void BindingsManager::mousePressed(const SDL_MouseButtonEvent& arg, Uint8 deviceID)
     {
         mInputBinder->mousePressed(arg, deviceID);
     }
 
-    void BindingsManager::mouseReleased(const SDL_MouseButtonEvent& arg, int deviceID)
+    void BindingsManager::mouseReleased(const SDL_MouseButtonEvent& arg, Uint8 deviceID)
     {
         mInputBinder->mouseReleased(arg, deviceID);
     }
diff --git a/apps/openmw/mwinput/bindingsmanager.hpp b/apps/openmw/mwinput/bindingsmanager.hpp
index a11baf74de..bee9e07cf7 100644
--- a/apps/openmw/mwinput/bindingsmanager.hpp
+++ b/apps/openmw/mwinput/bindingsmanager.hpp
@@ -47,8 +47,8 @@ namespace MWInput
 
         SDL_GameController* getControllerOrNull() const;
 
-        void mousePressed(const SDL_MouseButtonEvent& evt, int deviceID);
-        void mouseReleased(const SDL_MouseButtonEvent& arg, int deviceID);
+        void mousePressed(const SDL_MouseButtonEvent& evt, Uint8 deviceID);
+        void mouseReleased(const SDL_MouseButtonEvent& arg, Uint8 deviceID);
         void mouseMoved(const SDLUtil::MouseMotionEvent& arg);
         void mouseWheelMoved(const SDL_MouseWheelEvent& arg);
 
diff --git a/apps/openmw/mwsound/ffmpeg_decoder.cpp b/apps/openmw/mwsound/ffmpeg_decoder.cpp
index bd63d3de40..a6f3d0336f 100644
--- a/apps/openmw/mwsound/ffmpeg_decoder.cpp
+++ b/apps/openmw/mwsound/ffmpeg_decoder.cpp
@@ -21,7 +21,9 @@ namespace MWSound
             std::streamsize count = stream.gcount();
             if (count == 0)
                 return AVERROR_EOF;
-            return count;
+            if (count > std::numeric_limits<int>::max())
+                return AVERROR_BUG;
+            return static_cast<int>(count);
         }
         catch (std::exception&)
         {
@@ -72,7 +74,7 @@ namespace MWSound
         if (!mStream)
             return false;
 
-        int stream_idx = mStream - mFormatCtx->streams;
+        std::ptrdiff_t stream_idx = mStream - mFormatCtx->streams;
         while (av_read_frame(mFormatCtx, &mPacket) >= 0)
         {
             /* Check if the packet belongs to this stream */
@@ -427,9 +429,9 @@ namespace MWSound
 
     size_t FFmpeg_Decoder::getSampleOffset()
     {
-        int delay = (mFrameSize - mFramePos) / av_get_channel_layout_nb_channels(mOutputChannelLayout)
+        std::size_t delay = (mFrameSize - mFramePos) / av_get_channel_layout_nb_channels(mOutputChannelLayout)
             / av_get_bytes_per_sample(mOutputSampleFormat);
-        return (int)(mNextPts * mCodecCtx->sample_rate) - delay;
+        return static_cast<std::size_t>(mNextPts * mCodecCtx->sample_rate) - delay;
     }
 
     FFmpeg_Decoder::FFmpeg_Decoder(const VFS::Manager* vfs)
diff --git a/apps/openmw/mwsound/ffmpeg_decoder.hpp b/apps/openmw/mwsound/ffmpeg_decoder.hpp
index 88dd3316f5..9d15888fcf 100644
--- a/apps/openmw/mwsound/ffmpeg_decoder.hpp
+++ b/apps/openmw/mwsound/ffmpeg_decoder.hpp
@@ -41,8 +41,8 @@ namespace MWSound
         AVPacket mPacket;
         AVFrame* mFrame;
 
-        int mFrameSize;
-        int mFramePos;
+        std::size_t mFrameSize;
+        std::size_t mFramePos;
 
         double mNextPts;
 
diff --git a/apps/openmw/mwsound/loudness.cpp b/apps/openmw/mwsound/loudness.cpp
index b1c1a3f2af..c99ef15e9f 100644
--- a/apps/openmw/mwsound/loudness.cpp
+++ b/apps/openmw/mwsound/loudness.cpp
@@ -15,8 +15,8 @@ namespace MWSound
             return;
 
         int samplesPerSegment = static_cast<int>(mSampleRate / mSamplesPerSec);
-        int numSamples = bytesToFrames(mQueue.size(), mChannelConfig, mSampleType);
-        int advance = framesToBytes(1, mChannelConfig, mSampleType);
+        std::size_t numSamples = bytesToFrames(mQueue.size(), mChannelConfig, mSampleType);
+        std::size_t advance = framesToBytes(1, mChannelConfig, mSampleType);
 
         int segment = 0;
         int sample = 0;
@@ -61,7 +61,7 @@ namespace MWSound
         if (mSamplesPerSec <= 0.0f || mSamples.empty() || sec < 0.0f)
             return 0.0f;
 
-        size_t index = std::clamp<size_t>(sec * mSamplesPerSec, 0, mSamples.size() - 1);
+        size_t index = std::clamp<size_t>(static_cast<size_t>(sec * mSamplesPerSec), 0, mSamples.size() - 1);
         return mSamples[index];
     }
 
diff --git a/components/bsa/ba2dx10file.cpp b/components/bsa/ba2dx10file.cpp
index aa3f8d0581..946a68fcd5 100644
--- a/components/bsa/ba2dx10file.cpp
+++ b/components/bsa/ba2dx10file.cpp
@@ -6,16 +6,21 @@
 
 #include <lz4frame.h>
 
+
+#if defined(_MSC_VER)
+// why is this necessary? These are included with /external:I
+#pragma warning(push)
+#pragma warning(disable : 4706)
+#pragma warning(disable : 4702)
 #include <boost/iostreams/copy.hpp>
 #include <boost/iostreams/filtering_stream.hpp>
 #include <boost/iostreams/filtering_streambuf.hpp>
-
-#if defined(_MSC_VER)
-#pragma warning(push)
-#pragma warning(disable : 4706)
 #include <boost/iostreams/filter/zlib.hpp>
 #pragma warning(pop)
 #else
+#include <boost/iostreams/copy.hpp>
+#include <boost/iostreams/filtering_stream.hpp>
+#include <boost/iostreams/filtering_streambuf.hpp>
 #include <boost/iostreams/filter/zlib.hpp>
 #endif
 
diff --git a/components/bsa/ba2gnrlfile.cpp b/components/bsa/ba2gnrlfile.cpp
index 02df12593c..436f5cc4bc 100644
--- a/components/bsa/ba2gnrlfile.cpp
+++ b/components/bsa/ba2gnrlfile.cpp
@@ -6,15 +6,18 @@
 
 #include <lz4frame.h>
 
-#include <boost/iostreams/copy.hpp>
-#include <boost/iostreams/filtering_streambuf.hpp>
-
 #if defined(_MSC_VER)
+// why is this necessary? These are included with /external:I
 #pragma warning(push)
 #pragma warning(disable : 4706)
+#pragma warning(disable : 4702)
+#include <boost/iostreams/copy.hpp>
+#include <boost/iostreams/filtering_streambuf.hpp>
 #include <boost/iostreams/filter/zlib.hpp>
 #pragma warning(pop)
 #else
+#include <boost/iostreams/copy.hpp>
+#include <boost/iostreams/filtering_streambuf.hpp>
 #include <boost/iostreams/filter/zlib.hpp>
 #endif
 
diff --git a/components/bsa/compressedbsafile.cpp b/components/bsa/compressedbsafile.cpp
index 99efe7a587..ea39b42540 100644
--- a/components/bsa/compressedbsafile.cpp
+++ b/components/bsa/compressedbsafile.cpp
@@ -30,15 +30,18 @@
 
 #include <lz4frame.h>
 
-#include <boost/iostreams/copy.hpp>
-#include <boost/iostreams/filtering_streambuf.hpp>
 
 #if defined(_MSC_VER)
 #pragma warning(push)
 #pragma warning(disable : 4706)
+#pragma warning(disable : 4702)
+#include <boost/iostreams/copy.hpp>
+#include <boost/iostreams/filtering_streambuf.hpp>
 #include <boost/iostreams/filter/zlib.hpp>
 #pragma warning(pop)
 #else
+#include <boost/iostreams/copy.hpp>
+#include <boost/iostreams/filtering_streambuf.hpp>
 #include <boost/iostreams/filter/zlib.hpp>
 #endif
 
@@ -168,7 +171,7 @@ namespace Bsa
                     name.resize(input.gcount());
                     if (name.back() != '\0')
                         fail("Failed to read a filename: filename is too long");
-                    mHeader.mFileNamesLength -= input.gcount();
+                    mHeader.mFileNamesLength -= static_cast<std::uint32_t>(input.gcount());
                     file.mName.insert(file.mName.begin(), folder.mName.begin(), folder.mName.end());
                     file.mName.insert(file.mName.begin() + folder.mName.size(), '\\');
                 }
diff --git a/components/debug/debugdraw.cpp b/components/debug/debugdraw.cpp
index 2bc7358259..cd98fe2b6d 100644
--- a/components/debug/debugdraw.cpp
+++ b/components/debug/debugdraw.cpp
@@ -124,7 +124,7 @@ static void generateCylinder(osg::Geometry& geom, float radius, float height, in
     for (int i = 0; i < subdiv; i++)
     {
         float theta = (float(i) / float(subdiv)) * osg::PI * 2.;
-        osg::Vec3 pos = sphereCoordToCartesian(theta, osg::PI_2, 1.);
+        osg::Vec3 pos = sphereCoordToCartesian(theta, osg::PI_2f, 1.);
         pos *= radius;
         pos.z() = height / 2.;
         vertices->push_back(pos);
@@ -150,7 +150,7 @@ static void generateCylinder(osg::Geometry& geom, float radius, float height, in
     for (int i = 0; i < subdiv; i++)
     {
         float theta = float(i) / float(subdiv) * osg::PI * 2.;
-        osg::Vec3 pos = sphereCoordToCartesian(theta, osg::PI_2, 1.);
+        osg::Vec3 pos = sphereCoordToCartesian(theta, osg::PI_2f, 1.);
         pos *= radius;
         pos.z() = -height / 2.;
         vertices->push_back(pos);
@@ -162,7 +162,7 @@ static void generateCylinder(osg::Geometry& geom, float radius, float height, in
     for (int i = 0; i < subdiv; i++)
     {
         float theta = float(i) / float(subdiv) * osg::PI * 2.;
-        osg::Vec3 normal = sphereCoordToCartesian(theta, osg::PI_2, 1.);
+        osg::Vec3 normal = sphereCoordToCartesian(theta, osg::PI_2f, 1.);
         auto posTop = normal;
         posTop *= radius;
         auto posBot = posTop;
diff --git a/components/debug/debugging.cpp b/components/debug/debugging.cpp
index d170cf1929..e9e50ff836 100644
--- a/components/debug/debugging.cpp
+++ b/components/debug/debugging.cpp
@@ -6,7 +6,15 @@
 #include <map>
 #include <memory>
 
+#ifdef _MSC_VER
+// TODO: why is this necessary? this has /external:I
+#pragma warning(push)
+#pragma warning(disable : 4702)
+#endif
 #include <boost/iostreams/stream.hpp>
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
 
 #include <components/crashcatcher/crashcatcher.hpp>
 #include <components/files/conversion.hpp>
@@ -111,7 +119,7 @@ namespace Debug
                 msg = msg.substr(1);
 
             char prefix[32];
-            int prefixSize;
+            std::size_t prefixSize;
             {
                 prefix[0] = '[';
                 const auto now = std::chrono::system_clock::now();
diff --git a/components/detournavigator/collisionshapetype.cpp b/components/detournavigator/collisionshapetype.cpp
index b20ae6147f..b68d5cd239 100644
--- a/components/detournavigator/collisionshapetype.cpp
+++ b/components/detournavigator/collisionshapetype.cpp
@@ -15,7 +15,7 @@ namespace DetourNavigator
                 return static_cast<CollisionShapeType>(value);
         }
         std::string error("Invalid CollisionShapeType value: \"");
-        error += value;
+        error += std::to_string(value);
         error += '"';
         throw std::invalid_argument(error);
     }
diff --git a/components/files/windowspath.cpp b/components/files/windowspath.cpp
index 9be3d13a46..bbe0325b58 100644
--- a/components/files/windowspath.cpp
+++ b/components/files/windowspath.cpp
@@ -101,7 +101,7 @@ namespace Files
         {
             // Key existed, let's try to read the install dir
             std::array<wchar_t, 512> buf{};
-            DWORD len = buf.size() * sizeof(wchar_t);
+            DWORD len = static_cast<DWORD>(buf.size() * sizeof(wchar_t));
 
             if (RegQueryValueExW(hKey, L"Installed Path", nullptr, nullptr, reinterpret_cast<LPBYTE>(buf.data()), &len)
                 == ERROR_SUCCESS)
diff --git a/components/fx/lexer.hpp b/components/fx/lexer.hpp
index 01b3a3a56a..fc7d4ec9d7 100644
--- a/components/fx/lexer.hpp
+++ b/components/fx/lexer.hpp
@@ -30,7 +30,7 @@ namespace fx
         public:
             struct Block
             {
-                int line;
+                std::size_t line;
                 std::string_view content;
             };
 
diff --git a/components/l10n/messagebundles.cpp b/components/l10n/messagebundles.cpp
index 4656116487..9a3dc5e00f 100644
--- a/components/l10n/messagebundles.cpp
+++ b/components/l10n/messagebundles.cpp
@@ -77,7 +77,7 @@ namespace l10n
             {
                 const auto key = it.first.as<std::string>();
                 const auto value = it.second.as<std::string>();
-                icu::UnicodeString pattern = icu::UnicodeString::fromUTF8(icu::StringPiece(value.data(), value.size()));
+                icu::UnicodeString pattern = icu::UnicodeString::fromUTF8(icu::StringPiece(value.data(), static_cast<std::int32_t>(value.size())));
                 icu::ErrorCode status;
                 UParseError parseError;
                 icu::MessageFormat message(pattern, langOrEn, parseError, status);
@@ -115,7 +115,7 @@ namespace l10n
         std::vector<icu::Formattable> argValues;
         for (auto& [k, v] : args)
         {
-            argNames.push_back(icu::UnicodeString::fromUTF8(icu::StringPiece(k.data(), k.size())));
+            argNames.push_back(icu::UnicodeString::fromUTF8(icu::StringPiece(k.data(), static_cast<std::int32_t>(k.size()))));
             argValues.push_back(v);
         }
         return formatMessage(key, argNames, argValues);
@@ -160,9 +160,9 @@ namespace l10n
         if (message)
         {
             if (!args.empty() && !argNames.empty())
-                message->format(argNames.data(), args.data(), args.size(), result, success);
+                message->format(argNames.data(), args.data(), static_cast<std::int32_t>(args.size()), result, success);
             else
-                message->format(nullptr, nullptr, args.size(), result, success);
+                message->format(nullptr, nullptr, static_cast<std::int32_t>(args.size()), result, success);
             checkSuccess(success, std::string("Failed to format message ") + key.data());
             result.toUTF8String(resultString);
             return resultString;
@@ -174,15 +174,15 @@ namespace l10n
         }
         UParseError parseError;
         icu::MessageFormat defaultMessage(
-            icu::UnicodeString::fromUTF8(icu::StringPiece(key.data(), key.size())), defaultLocale, parseError, success);
+            icu::UnicodeString::fromUTF8(icu::StringPiece(key.data(), static_cast<std::int32_t>(key.size()))), defaultLocale, parseError, success);
         if (!checkSuccess(success, std::string("Failed to create message ") + key.data(), parseError))
             // If we can't parse the key as a pattern, just return the key
             return std::string(key);
 
         if (!args.empty() && !argNames.empty())
-            defaultMessage.format(argNames.data(), args.data(), args.size(), result, success);
+            defaultMessage.format(argNames.data(), args.data(), static_cast<std::int32_t>(args.size()), result, success);
         else
-            defaultMessage.format(nullptr, nullptr, args.size(), result, success);
+            defaultMessage.format(nullptr, nullptr, static_cast<std::int32_t>(args.size()), result, success);
         checkSuccess(success, std::string("Failed to format message ") + key.data());
         result.toUTF8String(resultString);
         return resultString;
diff --git a/components/lua/scriptscontainer.cpp b/components/lua/scriptscontainer.cpp
index 9b4a119ba4..ff45b963ca 100644
--- a/components/lua/scriptscontainer.cpp
+++ b/components/lua/scriptscontainer.cpp
@@ -590,7 +590,7 @@ namespace LuaUtil
         updateTimerQueue(mGameTimersQueue, gameTime);
     }
 
-    static constexpr float instructionCountAvgCoef = 1.0 / 30; // averaging over approximately 30 frames
+    static constexpr float instructionCountAvgCoef = 1.0f / 30; // averaging over approximately 30 frames
 
     void ScriptsContainer::statsNextFrame()
     {
diff --git a/components/lua/utf8.cpp b/components/lua/utf8.cpp
index b486766b6a..2a585dac2d 100644
--- a/components/lua/utf8.cpp
+++ b/components/lua/utf8.cpp
@@ -14,7 +14,7 @@ namespace
         return (arg.get_type() == sol::type::lua_nil || arg.get_type() == sol::type::none);
     }
 
-    inline double getInteger(const sol::stack_proxy arg, const size_t n, std::string_view name)
+    inline std::int64_t getInteger(const sol::stack_proxy arg, const size_t n, std::string_view name)
     {
         double integer;
         if (!arg.is<double>())
@@ -25,7 +25,7 @@ namespace
             throw std::runtime_error(
                 Misc::StringUtils::format("bad argument #%i to '%s' (number has no integer representation)", n, name));
 
-        return integer;
+        return static_cast<std::int64_t>(integer);
     }
 
     // If the input 'pos' is negative, it is treated as counting from the end of the string,
@@ -104,7 +104,8 @@ namespace LuaUtf8
                     throw std::runtime_error(
                         "bad argument #" + std::to_string(i + 1) + " to 'char' (value out of range)");
 
-                result += converter.to_bytes(codepoint);
+                // this feels dodgy if wchar_t is 16-bit as MAXUTF won't fit in sixteen bits
+                result += converter.to_bytes(static_cast<wchar_t>(codepoint));
             }
             return result;
         };
diff --git a/components/misc/utf8stream.hpp b/components/misc/utf8stream.hpp
index 271376834d..5eb5f99b84 100644
--- a/components/misc/utf8stream.hpp
+++ b/components/misc/utf8stream.hpp
@@ -75,7 +75,7 @@ public:
             return std::make_pair(chr, cur);
         }
 
-        int octets;
+        std::size_t octets;
         UnicodeChar chr;
 
         std::tie(octets, chr) = getOctetCount(*cur++);
diff --git a/components/sdlutil/sdlmappings.cpp b/components/sdlutil/sdlmappings.cpp
index fe248e6f70..8a82206c33 100644
--- a/components/sdlutil/sdlmappings.cpp
+++ b/components/sdlutil/sdlmappings.cpp
@@ -83,7 +83,7 @@ namespace SDLUtil
 
     Uint8 myGuiMouseButtonToSdl(MyGUI::MouseButton button)
     {
-        Uint8 value = button.getValue() + 1;
+        Uint8 value = static_cast<Uint8>(button.getValue() + 1);
         if (value == SDL_BUTTON_RIGHT)
             value = SDL_BUTTON_MIDDLE;
         else if (value == SDL_BUTTON_MIDDLE)