diff --git a/_posts/help/1970-01-01-debian.md b/_posts/help/1970-01-01-debian.md
index 211180e60..93e941883 100644
--- a/_posts/help/1970-01-01-debian.md
+++ b/_posts/help/1970-01-01-debian.md
@@ -38,13 +38,14 @@ $ sudo apt install apt-transport-https
 <script id="apt-template" type="x-tmpl-markup">
 # 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
 deb https://mirrors.tuna.tsinghua.edu.cn/debian/ {{release_name}} main contrib non-free
-# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ {{release_name}} main contrib non-free
+# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ {{release_name}} main contrib non-free{{if release_name|notequals>sid}}
 deb https://mirrors.tuna.tsinghua.edu.cn/debian/ {{release_name}}-updates main contrib non-free
 # deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ {{release_name}}-updates main contrib non-free
 deb https://mirrors.tuna.tsinghua.edu.cn/debian/ {{release_name}}-backports main contrib non-free
 # deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ {{release_name}}-backports main contrib non-free
 deb https://mirrors.tuna.tsinghua.edu.cn/debian-security {{release_name}}{{release_security}} main contrib non-free
 # deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security {{release_name}}{{release_security}} main contrib non-free
+{{/if}}
 
 </script>
 {% endraw %}