diff --git a/code/DefaultIOSystem.cpp b/code/DefaultIOSystem.cpp
index 6e9c0321e..d65681b9b 100644
--- a/code/DefaultIOSystem.cpp
+++ b/code/DefaultIOSystem.cpp
@@ -76,7 +76,7 @@ bool DefaultIOSystem::Exists( const char* pFile) const
 #ifdef _WIN32
     wchar_t fileName16[PATHLIMIT];
 
-    bool isUnicode = IsTextUnicode(pFile, int(strlen(pFile)), NULL);
+    bool isUnicode = IsTextUnicode(pFile, static_cast<nt>(strlen(pFile)), NULL);
     if (isUnicode) {
 
         MultiByteToWideChar(CP_UTF8, MB_PRECOMPOSED, pFile, -1, fileName16, PATHLIMIT);
@@ -110,7 +110,7 @@ IOStream* DefaultIOSystem::Open( const char* strFile, const char* strMode)
     FILE* file;
 #ifdef _WIN32
     wchar_t fileName16[PATHLIMIT];
-    bool isUnicode = IsTextUnicode(strFile, int(strlen(strFile)), NULL );
+    bool isUnicode = IsTextUnicode(strFile, static_cast<int>(strlen(strFile)), NULL );
     if (isUnicode) {
         MultiByteToWideChar(CP_UTF8, MB_PRECOMPOSED, strFile, -1, fileName16, PATHLIMIT);
         std::string mode8(strMode);
@@ -158,7 +158,7 @@ inline static void MakeAbsolutePath (const char* in, char* _out)
 {
     ai_assert(in && _out);
 #if defined( _MSC_VER ) || defined( __MINGW32__ )
-    bool isUnicode = IsTextUnicode(in, int(strlen(in)), NULL);
+    bool isUnicode = IsTextUnicode(in, static_cast<int>(strlen(in)), NULL);
     if (isUnicode) {
         wchar_t out16[PATHLIMIT];
         wchar_t in16[PATHLIMIT];