diff --git a/db/migrate/20220706104313_add_unit_type_sh.rb b/db/migrate/20220706104313_add_unit_type_sh.rb
index 008d29e76..fa7aa9732 100644
--- a/db/migrate/20220706104313_add_unit_type_sh.rb
+++ b/db/migrate/20220706104313_add_unit_type_sh.rb
@@ -1,5 +1,7 @@
 class AddUnitTypeSh < ActiveRecord::Migration[7.0]
-  change_table :case_logs, bulk: true do |t|
-    t.integer :unittype_sh
+  def change
+    change_table :case_logs, bulk: true do |t|
+      t.integer :unittype_sh
+    end
   end
 end