diff --git a/include/wx/string.h b/include/wx/string.h
index 7969657cc3..6d8312f2ad 100644
--- a/include/wx/string.h
+++ b/include/wx/string.h
@@ -208,7 +208,7 @@ struct WXDLLEXPORT wxStringData
 
   // VC++ will refuse to inline this function but profiling shows that it
   // is wrong
-#if defined(__VISUALC__) && defined(__WIN32__)
+#if defined(__VISUALC__) && (__VISUALC__ >= 1200)
   __forceinline
 #endif
   void  Unlock() { if ( !IsEmpty() && --nRefs == 0) free(this);  }