diff --git a/_config.yml b/_config.yml
index 0562b57..bb9fd61 100644
--- a/_config.yml
+++ b/_config.yml
@@ -15,8 +15,8 @@ defaults:
 collections:
   content:
     output: true
-    permalink: /:name
+    permalink: /:name:output_ext
   projects:
     output: true
-    permalink: /:collection/:name
+    permalink: /:collection/:name:output_ext