diff --git a/liveuser/.local/bin/key-sign.sh b/liveuser/.local/bin/key-sign.sh
index d686df3c..40f618d8 100755
--- a/liveuser/.local/bin/key-sign.sh
+++ b/liveuser/.local/bin/key-sign.sh
@@ -58,9 +58,7 @@ fi
 
 grep_text=$(ss -nlp | grep 9050)
 if [[ "$?" == 0 ]]; then
-    export http_proxy="socks5://127.0.0.1:9050"
-    export https_proxy="socks5://127.0.0.1:9050"
-    export ftp_proxy="socks5://127.0.0.1:9050"
+    export {http,https,ftp}_proxy="socks5://127.0.0.1:9050"
 fi
 
 ping -c 1 1.1.1.1 > /dev/null