diff --git a/src/idle.c b/src/idle.c
index fab4b8243934668d2ff3c3f5465152ab156fd15c..630ce0cdc72ce48dd7922dc59d2cb27e4007f4aa 100644
--- a/src/idle.c
+++ b/src/idle.c
@@ -32,7 +32,7 @@
 
 #if defined (RT_USING_HOOK)
 #ifndef RT_USING_IDLE_HOOK
-#deifne RT_USING_IDLE_HOOK 1
+#define RT_USING_IDLE_HOOK 1
 #endif
 #endif