diff --git a/_config.yml b/_config.yml
index 6bcb8da..24c758f 100644
--- a/_config.yml
+++ b/_config.yml
@@ -8,7 +8,7 @@ baseurl: ""
 url: "https://chaospott.de"
 # Build settings
 markdown: kramdown
-permalink: /:year/:month/:day/:title
+permalink: /:year/:month/:day/:title:output_ext
 paginate: 5
 paginate_path: "/blog/:num"
 plugins: [jekyll-paginate]