diff --git a/apps/openmw/mwgui/journalbooks.cpp b/apps/openmw/mwgui/journalbooks.cpp
index 2682323cea..683fe9208f 100644
--- a/apps/openmw/mwgui/journalbooks.cpp
+++ b/apps/openmw/mwgui/journalbooks.cpp
@@ -169,6 +169,15 @@ namespace
 namespace MWGui
 {
 
+MWGui::BookTypesetter::Utf8Span to_utf8_span (char const * text)
+{
+    typedef MWGui::BookTypesetter::Utf8Point point;
+
+    point begin = reinterpret_cast <point> (text);
+
+    return MWGui::BookTypesetter::Utf8Span (begin, begin + strlen (text));
+}
+
 typedef TypesetBook::Ptr book;
 
 JournalBooks::JournalBooks (JournalViewModel::Ptr model) :
diff --git a/apps/openmw/mwgui/journalbooks.hpp b/apps/openmw/mwgui/journalbooks.hpp
index b9c0a60b3c..819bda0fd2 100644
--- a/apps/openmw/mwgui/journalbooks.hpp
+++ b/apps/openmw/mwgui/journalbooks.hpp
@@ -6,14 +6,7 @@
 
 namespace MWGui
 {
-    MWGui::BookTypesetter::Utf8Span to_utf8_span (char const * text)
-    {
-        typedef MWGui::BookTypesetter::Utf8Point point;
-
-        point begin = reinterpret_cast <point> (text);
-
-        return MWGui::BookTypesetter::Utf8Span (begin, begin + strlen (text));
-    }
+    MWGui::BookTypesetter::Utf8Span to_utf8_span (char const * text);
 
     struct JournalBooks
     {