diff --git a/db/migrate/20150513094042_add_index_on_post_actions.rb b/db/migrate/20150513094042_add_index_on_post_actions.rb
new file mode 100644
index 0000000000000..e79c0ce9bed55
--- /dev/null
+++ b/db/migrate/20150513094042_add_index_on_post_actions.rb
@@ -0,0 +1,5 @@
+class AddIndexOnPostActions < ActiveRecord::Migration
+  def change
+    add_index :post_actions, [:user_id, :post_action_type_id], where: 'deleted_at IS NULL'
+  end
+end