diff --git a/app/models/submission.rb b/app/models/submission.rb
index 8ee7c541..b8667e68 100644
--- a/app/models/submission.rb
+++ b/app/models/submission.rb
@@ -42,7 +42,7 @@ class Submission < ActiveRecord::Base
       score / exercise.maximum_score
     else
       0
-    return
+    end
   end
 
   def percentage