diff --git a/extensions/pknock/xt_pknock.c b/extensions/pknock/xt_pknock.c
index cb110ee..f754568 100644
--- a/extensions/pknock/xt_pknock.c
+++ b/extensions/pknock/xt_pknock.c
@@ -701,7 +701,11 @@ msg_to_userspace_nl(const struct xt_pknock_mtinfo *info,
 
 	memcpy(m + 1, &msg, m->len);
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
+	cn_netlink_send(m, 0, multicast_group, GFP_ATOMIC);
+#else
 	cn_netlink_send(m, multicast_group, GFP_ATOMIC);
+#endif
 
 	kfree(m);
 #endif