diff --git a/package/firewall/files/uci_firewall.sh b/package/firewall/files/uci_firewall.sh
index 27e9dd71d6b5c2f979068c3459c71c19ca2bdb3e..88e6976dace280f1e10603f6a019f7f8999e767c 100755
--- a/package/firewall/files/uci_firewall.sh
+++ b/package/firewall/files/uci_firewall.sh
@@ -222,7 +222,7 @@ fw_redirect() {
 	config_get protocol $1 protocol
 	[ -z "$src" -o -z "$dest_ip" ] && { \
 		echo "redirect needs src and dest_ip"; return ; }
-	[ -n "$dest_port" -a -z "$proto" ] && { \
+	[ -n "$dest_port" -a -z "$protocol" ] && { \
 		echo "dport may only be used it proto is defined"; return; }
 	$IPTABLES -A zone_${src}_prerouting -t nat \
 		${protocol:+-p $protocol} \