diff --git a/src/alpine_bits_python/migrations.py b/src/alpine_bits_python/migrations.py
index 7c38ef0..bc887ae 100644
--- a/src/alpine_bits_python/migrations.py
+++ b/src/alpine_bits_python/migrations.py
@@ -292,7 +292,7 @@ async def _backfill_acked_requests_username(engine: AsyncEngine, config: dict[st
                 UPDATE acked_requests
                 SET username = :username
                 WHERE unique_id IN (
-                    SELECT unique_id FROM reservations WHERE hotel_code = :hotel_id
+                    SELECT md5_unique_id FROM reservations WHERE hotel_code = :hotel_id
                 )
                 AND username IS NULL
             """)