diff --git a/res/res_rtp_asterisk.c b/res/res_rtp_asterisk.c
index d281fa5153..3abb6c686a 100644
--- a/res/res_rtp_asterisk.c
+++ b/res/res_rtp_asterisk.c
@@ -2400,7 +2400,7 @@ static char *rtp_do_debug_ip(struct ast_cli_args *a)
 	struct hostent *hp;
 	struct ast_hostent ahp;
 	int port = 0;
-	char *p, *arg = ast_strdupa(a->argv[3]);
+	char *p, *arg = ast_strdupa(a->argv[4]);
 
 	p = strstr(arg, ":");
 	if (p) {