diff --git a/persistence/sql/migrations/sql/20240214113828000000_courier_dispatch_indices.mysql.down.sql b/persistence/sql/migrations/sql/20240214113828000000_courier_dispatch_indices.mysql.down.sql
index e2f4e4df064e..7e45f3f3d284 100644
--- a/persistence/sql/migrations/sql/20240214113828000000_courier_dispatch_indices.mysql.down.sql
+++ b/persistence/sql/migrations/sql/20240214113828000000_courier_dispatch_indices.mysql.down.sql
@@ -1,4 +1,6 @@
 CREATE INDEX courier_message_dispatches_id_message_id_nid_idx ON courier_message_dispatches (id ASC, message_id ASC, nid ASC);
 
-DROP INDEX courier_message_dispatches_message_id_idx ON courier_message_dispatches;
+-- These can't be removed because of foreign key constraints which disallow index deletion in MySQL.
+
+-- DROP INDEX courier_message_dispatches_message_id_idx ON courier_message_dispatches;
 -- DROP INDEX courier_message_dispatches_nid_idx ON courier_message_dispatches;