diff --git a/migrations/versions/0088_migrate_existing_svc_perms.py b/migrations/versions/0088_migrate_existing_svc_perms.py
index 2556d5bf0..44d830cf4 100644
--- a/migrations/versions/0088_migrate_existing_svc_perms.py
+++ b/migrations/versions/0088_migrate_existing_svc_perms.py
@@ -12,26 +12,29 @@ down_revision = '0087_scheduled_notifications'
 
 from alembic import op
 import sqlalchemy as sa
+import time
+
+migration_date = time.strftime('2017-05-26 17:30:00.000000')
 
 
 def upgrade():
     def get_values(permission):
-        return "SELECT id, '{0}' FROM services WHERE "\
+        return "SELECT id, '{0}', '{1}' FROM services WHERE "\
             "id NOT IN (SELECT service_id FROM service_permissions "\
-            "WHERE service_id=id AND permission='{0}')".format(permission)
+            "WHERE service_id=id AND permission='{0}')".format(permission, migration_date)
 
     def get_values_if_flag(permission, flag):
-        return "SELECT id, '{0}' FROM services WHERE "\
-            "{1} AND id NOT IN (SELECT service_id FROM service_permissions "\
-            "WHERE service_id=id AND permission='{0}')".format(permission, flag)
+        return "SELECT id, '{0}', '{1}' FROM services WHERE "\
+            "{2} AND id NOT IN (SELECT service_id FROM service_permissions "\
+            "WHERE service_id=id AND permission='{0}')".format(permission, migration_date, flag)
 
-    op.execute("INSERT INTO service_permissions (service_id, permission) {}".format(get_values('sms')))
-    op.execute("INSERT INTO service_permissions (service_id, permission) {}".format(get_values('email')))
-    op.execute("INSERT INTO service_permissions (service_id, permission) {}".format(
+    op.execute("INSERT INTO service_permissions (service_id, permission, created_at) {}".format(get_values('sms')))
+    op.execute("INSERT INTO service_permissions (service_id, permission, created_at) {}".format(get_values('email')))
+    op.execute("INSERT INTO service_permissions (service_id, permission, created_at) {}".format(
         get_values_if_flag('letter', 'can_send_letters')))
-    op.execute("INSERT INTO service_permissions (service_id, permission) {}".format(
+    op.execute("INSERT INTO service_permissions (service_id, permission, created_at) {}".format(
         get_values_if_flag('international_sms', 'can_send_international_sms')))
 
 
 def downgrade():
-    op.execute("DELETE FROM service_permissions WHERE created_at IS NULL")
+    op.execute("DELETE FROM service_permissions WHERE created_at = '{}'::timestamp".format(migration_date))