diff --git a/include/net/esp.h b/include/net/esp.h
index d58451331dbd..1356dda00d22 100644
--- a/include/net/esp.h
+++ b/include/net/esp.h
@@ -13,7 +13,7 @@ struct esp_data {
 	struct crypto_aead *aead;
 };
 
-extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
+void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
 
 struct ip_esp_hdr;