diff --git a/_posts/help/1970-01-01-hackage.md b/_posts/help/1970-01-01-hackage.md
index 52c4eee..dadea05 100644
--- a/_posts/help/1970-01-01-hackage.md
+++ b/_posts/help/1970-01-01-hackage.md
@@ -61,7 +61,7 @@ remote-repo: mirrors.tuna.tsinghua.edu.cn:http://mirrors.tuna.tsinghua.edu.cn/ha
 
 ```yaml
 package-indices:
-  - download-prefix: http://mirrors.tuna.tsinghua.edu.cn/hackage
+  - download-prefix: http://mirrors.tuna.tsinghua.edu.cn/hackage/
     hackage-security:
         keyids:
         - 0a5c7ea47cd1b15f01f5f51a33adda7e655bc0f0b0615baa8e271f4c3351e21d