diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index a75c740..bd4645b 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -297,8 +297,7 @@
 extern int	   dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
 extern void	   dccp_send_close(struct sock *sk, const int active);
 extern int	   dccp_invalid_packet(struct sk_buff *skb);
-extern u32	   dccp_sample_rtt(struct sock *sk, ktime_t t_recv,
-				   ktime_t *t_history);
+extern u32	   dccp_sample_rtt(struct sock *sk, long delta);
 
 static inline int dccp_bad_service_code(const struct sock *sk,
 					const __be32 service)