diff --git a/app/models/submission.rb b/app/models/submission.rb
--- a/app/models/submission.rb
+++ b/app/models/submission.rb
@@ -16,7 +16,7 @@
     last_sub = find(:first, 
                     :conditions => {:user_id => user_id,
                       :problem_id => problem_id},
-                    :order => 'submitted_at DESC')
+                    :order => 'number DESC')
     return last_sub
   end