diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index fe501d2186bc..eeace9b509ce 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -238,8 +238,7 @@ static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
 #else
 static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
 {
-	kfree_skb(skb);
-
+	WARN_ON(1);
 	return -EOPNOTSUPP;
 }
 #endif
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index a3fa3eda388a..62bb9651133c 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -255,8 +255,7 @@ static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
 #else
 static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
 {
-	kfree_skb(skb);
-
+	WARN_ON(1);
 	return -EOPNOTSUPP;
 }
 #endif