diff --git a/luci-app-passwall/root/usr/share/passwall/app.sh b/luci-app-passwall/root/usr/share/passwall/app.sh
index cbbdd2c42..6b0429cc5 100755
--- a/luci-app-passwall/root/usr/share/passwall/app.sh
+++ b/luci-app-passwall/root/usr/share/passwall/app.sh
@@ -205,7 +205,7 @@ check_port_exists() {
 check_depends() {
 	local tables=${1}
 	local status=0
-	if [ tables == "iptables" ]; then
+	if [ "$tables" == "iptables" ]; then
 		for depends in "iptables-mod-tproxy" "iptables-mod-socket" "iptables-mod-iprange" "iptables-mod-conntrack-extra" "kmod-ipt-nat"; do
 			[ -z "$(opkg status ${depends} 2>/dev/null | grep 'Status' | awk -F ': ' '{print $2}' 2>/dev/null)" ] && echolog "$tables透明代理基础依赖 $depends 未安装..." && status=1
 		done