diff --git a/include/net/checksum.h b/include/net/checksum.h
index 600d1d705bb8..8f59ca50477c 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -107,11 +107,11 @@ static inline void csum_replace2(__sum16 *sum, __be16 from, __be16 to)
 }
 
 struct sk_buff;
-extern void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
-				     __be32 from, __be32 to, int pseudohdr);
-extern void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
-				      const __be32 *from, const __be32 *to,
-				      int pseudohdr);
+void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
+			      __be32 from, __be32 to, int pseudohdr);
+void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
+			       const __be32 *from, const __be32 *to,
+			       int pseudohdr);
 
 static inline void inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,
 					    __be16 from, __be16 to,