diff --git a/db/migrate/20240304030429_topic_id_on_incoming_email_index.rb b/db/migrate/20240304030429_topic_id_on_incoming_email_index.rb
index 43d378313d5..535179245f8 100644
--- a/db/migrate/20240304030429_topic_id_on_incoming_email_index.rb
+++ b/db/migrate/20240304030429_topic_id_on_incoming_email_index.rb
@@ -2,7 +2,12 @@
 class TopicIdOnIncomingEmailIndex < ActiveRecord::Migration[7.0]
   disable_ddl_transaction!
 
-  def change
+  def up
+    remove_index :incoming_emails, :topic_id, if_exists: true
     add_index :incoming_emails, :topic_id, algorithm: :concurrently
   end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
 end