diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index 61c6a27bf202..ecd8146089ee 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -400,6 +400,7 @@ static int seg6_do_srh(struct sk_buff *skb, struct dst_entry *cache_dst)
 	struct dst_entry *dst = skb_dst(skb);
 	struct seg6_iptunnel_encap *tinfo;
 	struct seg6_lwt *slwt;
+	unsigned int headroom;
 	int proto, err = 0;
 
 	slwt = seg6_lwt_lwtunnel(dst->lwtstate);
@@ -446,8 +447,13 @@ static int seg6_do_srh(struct sk_buff *skb, struct dst_entry *cache_dst)
 		if (!skb_mac_header_was_set(skb))
 			return -EINVAL;
 
-		if (pskb_expand_head(skb, skb->mac_len, 0, GFP_ATOMIC) < 0)
-			return -ENOMEM;
+		headroom = skb->mac_len + sizeof(struct ipv6hdr) +
+			   ipv6_optlen(tinfo->srh) +
+			   dst_dev_overhead(cache_dst, skb);
+
+		err = skb_cow_head(skb, headroom);
+		if (unlikely(err))
+			return err;
 
 		skb_mac_header_rebuild(skb);
 		skb_push(skb, skb->mac_len);