diff --git a/lib/msg.c b/lib/msg.c
index 23c137d..2613c78 100644
--- a/lib/msg.c
+++ b/lib/msg.c
@@ -178,7 +178,7 @@ int nlmsg_valid_hdr(const struct nlmsghdr *nlh, int hdrlen)
  */
 int nlmsg_ok(const struct nlmsghdr *nlh, int remaining)
 {
-	return (remaining >= sizeof(struct nlmsghdr) &&
+	return (remaining >= (int)sizeof(struct nlmsghdr) &&
 		nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&
 		nlh->nlmsg_len <= remaining);
 }