diff --git a/lib/app.rb b/lib/app.rb
index 99bcd00..82328ac 100644
--- a/lib/app.rb
+++ b/lib/app.rb
@@ -33,7 +33,7 @@ class App < Sinatra::Base
     # A custom 404 page
     #
     not_found do
-      JSON.dump(error: 'not found')
+      JSON.dump(error: 'not found', status: 404, description: 'Document not found')
     end
 
     #
diff --git a/spec/lib/app_spec.rb b/spec/lib/app_spec.rb
index 090311b..ee008a6 100644
--- a/spec/lib/app_spec.rb
+++ b/spec/lib/app_spec.rb
@@ -102,7 +102,9 @@ def show_backtrace(response)
       }
       expect(last_response.status).to eq 404
       expect(last_response.content_type).to eq 'application/json'
-      expect(JSON.parse(last_response.body)).to be_a Hash
+      expect(JSON.parse(last_response.body)).to match(
+        { "status" => 404, "description" => "Document not found", "error" => "not found" }
+      )
       expect(Colore::Sidekiq::ConversionWorker).not_to have_received(:perform_async)
     end
   end