diff --git a/backend/db/migrate/20260126124100_add_unique_index_to_ip_addresses.rb b/backend/db/migrate/20260126124100_add_unique_index_to_ip_addresses.rb
index 7d33f09..e80e116 100644
--- a/backend/db/migrate/20260126124100_add_unique_index_to_ip_addresses.rb
+++ b/backend/db/migrate/20260126124100_add_unique_index_to_ip_addresses.rb
@@ -1,3 +1,5 @@
 class AddUniqueIndexToIpAddresses < ActiveRecord::Migration[8.0]
-  add_index :ip_addresses, :ip_address, unique: true, name: 'index_ip_addresses_on_ip_address'
+  def change
+    add_index :ip_addresses, :ip_address, unique: true, name: 'index_ip_addresses_on_ip_address'
+  end
 end