diff --git a/app/controllers/commits_controller.rb b/app/controllers/commits_controller.rb
index 4ab40c30..6d3f1aea 100644
--- a/app/controllers/commits_controller.rb
+++ b/app/controllers/commits_controller.rb
@@ -64,7 +64,7 @@ class CommitsController < ApplicationController
       @commit.to_patch,
       type: "text/plain",
       disposition: 'attachment',
-      filename: "#{@commit.id.patch}"
+      filename: "#{@commit.id}.patch"
     )
   end