diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index c8c6e33d116340d8f1a902893c5e183d6ab118e2..2de3c464fe75b4e3bf1a57fd148dcc739d123761 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -358,7 +358,7 @@ static int pim6_rcv(struct sk_buff *skb)
 	if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
 	    (pim->flags & PIM_NULL_REGISTER) ||
 	    (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
-	     (u16)csum_fold(skb_checksum(skb, 0, skb->len, 0))))
+	     csum_fold(skb_checksum(skb, 0, skb->len, 0))))
 		goto drop;
 
 	/* check if the inner packet is destined to mcast group */