diff --git a/sys/net/if.c b/sys/net/if.c
index 0128fb8039e..1ca0893eb72 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -4873,6 +4873,9 @@ if_resolvemulti(if_t ifp, struct sockaddr **srcs, struct sockaddr *dst)
 int
 if_ioctl(if_t ifp, u_long cmd, void *data)
 {
+	if (ifp->if_ioctl == NULL)
+		return (EOPNOTSUPP);
+
 	return (ifp->if_ioctl(ifp, cmd, data));
 }