diff --git a/src/msw/toplevel.cpp b/src/msw/toplevel.cpp
index ae7a11fd57..03ef96e8d8 100644
--- a/src/msw/toplevel.cpp
+++ b/src/msw/toplevel.cpp
@@ -39,6 +39,14 @@
 
 #include "wx/msw/private.h"
 
+#ifndef ICON_BIG
+    #define ICON_BIG 1
+#endif
+
+#ifndef ICON_SMALL
+    #define ICON_SMALL 0
+#endif
+
 // ----------------------------------------------------------------------------
 // stubs for missing functions under MicroWindows
 // ----------------------------------------------------------------------------