diff --git a/sys/netinet6/ip6_input.c b/sys/netinet6/ip6_input.c
index 27c8e89b8cd..5654c942169 100644
--- a/sys/netinet6/ip6_input.c
+++ b/sys/netinet6/ip6_input.c
@@ -269,7 +269,7 @@ ip6_init(void)
 		panic("sizeof(protosw) != sizeof(ip6protosw)");
 #endif
 	pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
-	if (pr == 0)
+	if (pr == NULL)
 		panic("ip6_init");
 
 	/* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */