diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index 5ade54a78dbbb3a3618d10d5e3d21d5d67a5b2fe..ca5a8733000fa08b65c21b3456b052b9f48dde21 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -86,7 +86,7 @@ static inline void netpoll_poll_unlock(void *have)
 
 #else
 #define netpoll_rx(a) 0
-#define netpoll_poll_lock(a) 0
+#define netpoll_poll_lock(a) NULL
 #define netpoll_poll_unlock(a)
 #endif