diff --git a/apps/openmw/mwmechanics/npcstats.cpp b/apps/openmw/mwmechanics/npcstats.cpp
index 1e9003a2f3..0e4b3f44cc 100644
--- a/apps/openmw/mwmechanics/npcstats.cpp
+++ b/apps/openmw/mwmechanics/npcstats.cpp
@@ -265,7 +265,7 @@ void MWMechanics::NpcStats::increaseSkill(int skillIndex, const ESM::Class &clas
     MWBase::Environment::get().getWindowManager()->playSound("skillraise");
 
     std::string message = MWBase::Environment::get().getWindowManager ()->getGameSettingString ("sNotifyMessage39", "");
-    message = Misc::StringUtils::format(message, ("#{" + ESM::Skill::sSkillNameIds[skillIndex] + "}"), base);
+    message = Misc::StringUtils::format(message, ("#{" + ESM::Skill::sSkillNameIds[skillIndex] + "}"), static_cast<int>(base));
 
     if (readBook)
         message = "#{sBookSkillMessage}\n" + message;