diff --git a/install_pve7.sh b/install_pve7.sh
index f70bd83..97fc15e 100644
--- a/install_pve7.sh
+++ b/install_pve7.sh
@@ -66,7 +66,8 @@ else
 fi
 
 # 新增pve源
-case $(lsb_release -cs) in
+version=$(lsb_release -cs)
+case $version in
   jessie|stretch|buster|bullseye)
     repo_url="deb https://mirrors.tuna.tsinghua.edu.cn/proxmox/debian/pve ${version} pve-no-subscription"
     if [[ -n "${CN}" ]]; then