diff --git a/db/migrate/20150911064528_alter_user_activities.rb b/db/migrate/20150911064528_alter_user_activities.rb
index 07cccae89..b6ede5bdb 100644
--- a/db/migrate/20150911064528_alter_user_activities.rb
+++ b/db/migrate/20150911064528_alter_user_activities.rb
@@ -1,6 +1,6 @@
 class AlterUserActivities < ActiveRecord::Migration
   def up
-    UserActivity.each do |activity|
+    UserActivity.all.each do |activity|
       if activity.act_type == 'Message'
         if activity.act
           unless activity.act.parent_id.nil?