diff --git a/reactos/subsys/system/explorer/utility/utility.h b/reactos/subsys/system/explorer/utility/utility.h
index e28b5fdadb4..9cbf14df963 100644
--- a/reactos/subsys/system/explorer/utility/utility.h
+++ b/reactos/subsys/system/explorer/utility/utility.h
@@ -48,6 +48,7 @@
 #ifndef BTNS_BUTTON
 #define BTNS_BUTTON TBSTYLE_BUTTON //missing in old mingw headers
 #define BTNS_SEP TBSTYLE_SEP
+#define BTNS_NOPREFIX TBSTYLE_NOPREFIX
 #endif
 #ifndef TB_HITTEST	//missing in mingw headers
 #define TB_HITTEST (WM_USER+69)