diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index 897fa59c47de7..4d4399c5c5ea9 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -160,6 +160,14 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
 		hdr->hop_limit = ip6_dst_hoplimit(skb_dst(skb));
 
 		memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
+
+		/* the control block has been erased, so we have to set the
+		 * iif once again.
+		 * We read the receiving interface index directly from the
+		 * skb->skb_iif as it is done in the IPv4 receiving path (i.e.:
+		 * ip_rcv_core(...)).
+		 */
+		IP6CB(skb)->iif = skb->skb_iif;
 	}
 
 	hdr->nexthdr = NEXTHDR_ROUTING;