diff --git a/include/ucore/utils.h b/include/ucore/utils.h
index e70327c..0b2e358 100644
--- a/include/ucore/utils.h
+++ b/include/ucore/utils.h
@@ -94,7 +94,7 @@ const typeof( ((const type *)0)->member ) *__mptr = (ptr);    \
         fflush(stdout);\
     } while(0)
 #else
-    #define TRACEF(fmt, ...)
+    #define TRACEF(fmt, ...) do {} while(0)
 #endif
 
 /**