diff --git a/cookbooks/foundation/recipes/wiki.rb b/cookbooks/foundation/recipes/wiki.rb
index 25bd4e931..ef74bf091 100644
--- a/cookbooks/foundation/recipes/wiki.rb
+++ b/cookbooks/foundation/recipes/wiki.rb
@@ -41,7 +41,7 @@
   email_sender "webmaster@openstreetmap.org"
   email_sender_name "OSMF Wiki"
   private_accounts true
-  extra_file_extensions ["mp3"]
+  extra_file_extensions ["mp3", "pptx"]
   version "1.39"
 end