diff --git a/include/wx/msw/private.h b/include/wx/msw/private.h
index b1ee23b549..7ac00c9e05 100644
--- a/include/wx/msw/private.h
+++ b/include/wx/msw/private.h
@@ -612,6 +612,13 @@ inline void *wxSetWindowUserData(HWND hwnd, void *data)
 
 #else // __WIN32__
 
+#ifdef __VISUALC__
+    // strangely enough, VC++ 7.1 gives warnings about 32 -> 64 bit conversions
+    // in the functions below, even in spite of the explicit casts
+    #pragma warning(disable:4311)
+    #pragma warning(disable:4312)
+#endif
+
 inline void *wxGetWindowProc(HWND hwnd)
 {
     return (void *)::GetWindowLong(hwnd, GWL_WNDPROC);
@@ -632,6 +639,11 @@ inline void *wxSetWindowUserData(HWND hwnd, void *data)
     return (void *)::SetWindowLong(hwnd, GWL_USERDATA, (LONG)data);
 }
 
+#ifdef __VISUALC__
+    #pragma warning(default:4311)
+    #pragma warning(default:4312)
+#endif
+
 #endif // __WIN64__/__WIN32__
 
 #endif // wxUSE_GUI