diff --git a/app/models/user.rb b/app/models/user.rb
index 3202998..ef4050e 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -219,7 +219,7 @@ class User < ActiveRecord::Base
   end
 
   def undeleted_sent_messages
-    sent_messages.where(:deleted_by_author => 0)
+    sent_messages.where(:deleted_by_author => false)
   end
 
   def unread_message_count