Index: head/sys/netinet/tcp_lro.c
===================================================================
--- head/sys/netinet/tcp_lro.c
+++ head/sys/netinet/tcp_lro.c
@@ -347,9 +347,10 @@
 	if (ret != 0)
 		goto done;
 
-	ret = ma->m_pkthdr.flowid - mb->m_pkthdr.flowid;
-	if (ret != 0)
-		goto done;
+	if (ma->m_pkthdr.flowid > mb->m_pkthdr.flowid)
+		return (1);
+	else if (ma->m_pkthdr.flowid < mb->m_pkthdr.flowid)
+		return (-1);
 
 	ret = TCP_LRO_SEQUENCE(ma) - TCP_LRO_SEQUENCE(mb);
 done: