diff --git a/src/msw/utils.cpp b/src/msw/utils.cpp
index bc79244d0b..770ea11fe2 100644
--- a/src/msw/utils.cpp
+++ b/src/msw/utils.cpp
@@ -1097,6 +1097,8 @@ extern long wxEncodingToCharset(wxFontEncoding encoding)
 
         case wxFONTENCODING_CP437:
             return OEM_CHARSET;
+        default: // fix GCC warning
+            return -1;
     }
 
     // no way to translate this encoding into a Windows charset