diff --git a/scripts/lib.sh b/scripts/lib.sh
index f243f99c7..56b8e3764 100755
--- a/scripts/lib.sh
+++ b/scripts/lib.sh
@@ -53,7 +53,7 @@ LOCAL_ADDR=common
 ping -c 1 ipinfo.io > /dev/null 2>&1
 if [ "$?" == "0" ];then
     CN=$(curl -fsSL -m 10 http://ipinfo.io/json | grep "\"country\": \"CN\"")
-    if [ -z $CN ];then
+    if [ -z "$CN" ];then
         LOCAL_ADDR=cn
         HTTP_PREFIX="https://ghproxy.com/"
     fi