diff --git a/include/ck_cc.h b/include/ck_cc.h
index 4c35e19..f41d901 100644
--- a/include/ck_cc.h
+++ b/include/ck_cc.h
@@ -78,11 +78,11 @@
 #endif
 
 #ifndef CK_CC_LIKELY
-#define CK_CC_LIKELY(x)
+#define CK_CC_LIKELY(x) x
 #endif
 
 #ifndef CK_CC_UNLIKELY
-#define CK_CC_UNLIKELY(x)
+#define CK_CC_UNLIKELY(x) x
 #endif
 
 #endif /* _CK_CC_H */