diff --git a/sched_yield.h b/sched_yield.h
index 45030c57343..1cafb3b11f6 100644
--- a/sched_yield.h
+++ b/sched_yield.h
@@ -35,7 +35,7 @@
 #else
 #include <unistd.h>
 	/* fake sched_yield */
-#ifndef sched_yield()
+#ifndef sched_yield
 	#define sched_yield()	sleep(0)
 #endif
 #endif