diff --git a/tools/fwpatcher/main.c b/tools/fwpatcher/main.c
index 73daa6a798..d6b798637c 100644
--- a/tools/fwpatcher/main.c
+++ b/tools/fwpatcher/main.c
@@ -36,7 +36,7 @@
 #define EDIT_FILENAME 1
 #define BUTTON_BROWSE 2
 #define BUTTON_PATCH 3
-#define WM_COMMANDDRIVEN 0x8000
+#define WM_COMMANDDRIVEN WM_APP
 
 #define CTL_NUM 4