diff --git a/sbin/ifconfig/ifconfig.c b/sbin/ifconfig/ifconfig.c
index 3816fbebc7bf..a2bdaac28f5e 100644
--- a/sbin/ifconfig/ifconfig.c
+++ b/sbin/ifconfig/ifconfig.c
@@ -707,7 +707,7 @@ ifconfig(int argc, char *const *argv, const struct afswtch *afp)
 		if (afp->af_ridreq == NULL || afp->af_difaddr == 0) {
 			warnx("interface %s cannot change %s addresses!",
 			      name, afp->af_name);
-			clearaddr = NULL;
+			clearaddr = 0;
 		}
 	}
 	if (clearaddr) {
diff --git a/usr.sbin/rtadvd/rrenum.c b/usr.sbin/rtadvd/rrenum.c
index 95cbd24c00f1..14a8ab9bdcc4 100644
--- a/usr.sbin/rtadvd/rrenum.c
+++ b/usr.sbin/rtadvd/rrenum.c
@@ -244,7 +244,7 @@ do_pco(struct icmp6_router_renum *rr, int len, struct rr_pco_match *rpm)
 	int ifindex = 0;
 	struct in6_rrenumreq irr;
 
-	if ((rr_pco_check(len, rpm) != NULL))
+	if ((rr_pco_check(len, rpm) != 0))
 		return 1;
 
 	if (s == -1 && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {