diff --git a/lib/rtnetlink.c b/lib/rtnetlink.c
index 3b841371899..faa60d7c12f 100644
--- a/lib/rtnetlink.c
+++ b/lib/rtnetlink.c
@@ -172,7 +172,10 @@ static void add_rtattr(struct nlmsghdr *n, int type, const void *data, int alen)
 
 	rta->rta_type = type;
 	rta->rta_len = len;
-	memcpy(RTA_DATA(rta), data, alen);
+	if (alen > 0)
+	{
+		memcpy(RTA_DATA(rta), data, alen);
+	}
 	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
 }