diff --git a/luci-app-mosdns/root/usr/share/mosdns/mosdns.sh b/luci-app-mosdns/root/usr/share/mosdns/mosdns.sh
index c2b6be5..22d1af2 100755
--- a/luci-app-mosdns/root/usr/share/mosdns/mosdns.sh
+++ b/luci-app-mosdns/root/usr/share/mosdns/mosdns.sh
@@ -39,27 +39,27 @@ ad_block() (
 
 adlist_update() (
 	ad_source=$(uci -q get mosdns.config.ad_source)
-	[ $ad_source = "geosite.dat" ] && exit 0
+	[ "$ad_source" = "geosite.dat" ] && exit 0
 	AD_TMPDIR=$(mktemp -d) || exit 1
-	if [[ $ad_source =~ "^https://raw.githubusercontent.com" ]]; then
+	if [[ "$ad_source" =~ "^https://raw.githubusercontent.com" ]]; then
 		google_status=$(curl -I -4 -m 3 -o /dev/null -s -w %{http_code} http://www.google.com/generate_204)
-		[ $google_status -ne "204" ] && mirror="https://ghproxy.com/"
+		[ "$google_status" -ne "204" ] && mirror="https://ghproxy.com/"
 	fi
 	echo -e "\e[1;32mDownloading $mirror$ad_source\e[0m"
 	curl --connect-timeout 60 -m 90 --ipv4 -fSLo "$AD_TMPDIR/adlist.txt" "$mirror$ad_source"
 	if [ $? -ne 0 ]; then
-		rm -rf $AD_TMPDIR
+		rm -rf "$AD_TMPDIR"
 		exit 1
 	else
-		\cp $AD_TMPDIR/adlist.txt /etc/mosdns/rule/adlist.txt
-		rm -rf $AD_TMPDIR
+		\cp "$AD_TMPDIR/adlist.txt" /etc/mosdns/rule/adlist.txt
+		rm -rf "$AD_TMPDIR"
 	fi
 )
 
 geodat_update() (
 	geodat_download() (
 		google_status=$(curl -I -4 -m 3 -o /dev/null -s -w %{http_code} http://www.google.com/generate_204)
-		[ $google_status -ne "204" ] && mirror="https://ghproxy.com/"
+		[ "$google_status" -ne "204" ] && mirror="https://ghproxy.com/"
 		echo -e "\e[1;32mDownloading "$mirror"https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/$1\e[0m"
 		curl --connect-timeout 60 -m 900 --ipv4 -fSLo "$TMPDIR/$1" ""$mirror"https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/$1"
 	)