diff --git a/lib/travis/api/app/base.rb b/lib/travis/api/app/base.rb
index 90c73b42..92031836 100644
--- a/lib/travis/api/app/base.rb
+++ b/lib/travis/api/app/base.rb
@@ -20,7 +20,7 @@ class Travis::Api::App
 
     # hotfix??
     def route_missing
-      @app ? forward : halt 404
+      @app ? forward : halt(404)
     end
 
     def call(env)