diff --git a/net/netfilter/xt_tcpmss.c b/net/netfilter/xt_tcpmss.c
index 5c8a7b4..f90728f 100644
--- a/net/netfilter/xt_tcpmss.c
+++ b/net/netfilter/xt_tcpmss.c
@@ -25,7 +25,7 @@
 MODULE_ALIAS("ip6t_tcpmss");
 
 static bool
-tcpmss_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+tcpmss_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_tcpmss_match_info *info = par->matchinfo;
 	const struct tcphdr *th;