diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 28375e40b72d..8df4a736c495 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -174,7 +174,7 @@ struct pneigh_entry {
 	struct net_device	*dev;
 	u8			flags;
 	u8			protocol;
-	u8			key[];
+	u8			key[0];
 };
 
 /*