diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index b5ebeb3b0de0e..1c61aeb3a1c06 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -80,12 +80,12 @@ extern struct neigh_table nd_tbl;
 struct nd_msg {
         struct icmp6hdr	icmph;
         struct in6_addr	target;
-	__u8		opt[0];
+	__u8		opt[];
 };
 
 struct rs_msg {
 	struct icmp6hdr	icmph;
-	__u8		opt[0];
+	__u8		opt[];
 };
 
 struct ra_msg {
@@ -98,7 +98,7 @@ struct rd_msg {
 	struct icmp6hdr icmph;
 	struct in6_addr	target;
 	struct in6_addr	dest;
-	__u8		opt[0];
+	__u8		opt[];
 };
 
 struct nd_opt_hdr {