diff --git a/src/idle.c b/src/idle.c
index b821c66fd9..db87baa484 100644
--- a/src/idle.c
+++ b/src/idle.c
@@ -32,7 +32,7 @@
 
 #if defined (RT_USING_HOOK)
 #ifndef RT_USING_IDLE_HOOK
-#define RT_USING_IDLE_HOOK 1
+#define RT_USING_IDLE_HOOK
 #endif
 #endif