diff --git a/db/migrate/20180218004148_change_messages_attached_obj_id_type_to_int.rb b/db/migrate/20180218004148_change_messages_attached_obj_id_type_to_int.rb
new file mode 100644
index 000000000..9996b5e67
--- /dev/null
+++ b/db/migrate/20180218004148_change_messages_attached_obj_id_type_to_int.rb
@@ -0,0 +1,5 @@
+class ChangeMessagesAttachedObjIdTypeToInt < ActiveRecord::Migration
+  def change
+    change_column :messages, :attached_obj_id, 'integer USING attached_obj_id::integer'
+  end
+end
diff --git a/db/structure.sql b/db/structure.sql
index 881b1de36..16523bd5c 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -2186,7 +2186,7 @@ CREATE TABLE messages (
     registrar_id integer,
     body character varying NOT NULL,
     attached_obj_type character varying,
-    attached_obj_id character varying,
+    attached_obj_id integer,
     queued boolean,
     created_at timestamp without time zone,
     updated_at timestamp without time zone,
@@ -3635,7 +3635,7 @@ ALTER TABLE ONLY contacts
 
 
 --
--- Name: unique_session_id; Type: CONSTRAINT; Schema: public; Owner: -; Tablespace:
+-- Name: unique_session_id; Type: CONSTRAINT; Schema: public; Owner: -; Tablespace: 
 --
 
 ALTER TABLE ONLY epp_sessions
@@ -5098,3 +5098,5 @@ INSERT INTO schema_migrations (version) VALUES ('20180214200224');
 
 INSERT INTO schema_migrations (version) VALUES ('20180214213743');
 
+INSERT INTO schema_migrations (version) VALUES ('20180218004148');
+