diff --git a/contrib/traceroute/traceroute.c b/contrib/traceroute/traceroute.c
--- a/contrib/traceroute/traceroute.c
+++ b/contrib/traceroute/traceroute.c
@@ -1347,9 +1347,7 @@
 
 #if	defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
 int
-setpolicy(so, policy)
-	int so;
-	char *policy;
+setpolicy(int so, char *policy)
 {
 	char *buf;