diff --git a/src/main/resources/db/migration/2004022.sql b/src/main/resources/db/migration/2004022.sql
index 25a0d3378..a253e574e 100644
--- a/src/main/resources/db/migration/2004022.sql
+++ b/src/main/resources/db/migration/2004022.sql
@@ -6,15 +6,11 @@ ALTER TABLE `LetterSoundCorrespondence` RENAME TO `LetterSound`;
 
 DROP TABLE IF EXISTS `LetterSound_Letter`;
 ALTER TABLE `LetterSoundCorrespondence_Letter` RENAME TO `LetterSound_Letter`;
+ALTER TABLE `LetterSound_Letter` CHANGE `LetterSoundCorrespondence_id` `LetterSound_id` bigint(20) NOT NULL;
 
 DROP TABLE IF EXISTS `LetterSound_Sound`;
 ALTER TABLE `LetterSoundCorrespondence_Sound` RENAME TO `LetterSound_Sound`;
+ALTER TABLE `LetterSound_Sound` CHANGE `LetterSoundCorrespondence_id` `LetterSound_id` bigint(20) NOT NULL;
 
 DROP TABLE IF EXISTS `Word_LetterSound`;
 ALTER TABLE `Word_LetterSoundCorrespondence` RENAME TO `Word_LetterSound`;
-
-ALTER TABLE `LetterSound_Letter` DROP COLUMN `LetterSound_id`;
-ALTER TABLE `LetterSound_Letter` CHANGE `LetterSoundCorrespondence_id` `LetterSound_id` bigint(20) NOT NULL;
-
-ALTER TABLE `LetterSound_Sound` DROP COLUMN `LetterSound_id`;
-ALTER TABLE `LetterSound_Sound` CHANGE `LetterSoundCorrespondence_id` `LetterSound_id` bigint(20) NOT NULL;
\ No newline at end of file