diff --git a/htdocs/install/mysql/migration/22.0.0-23.0.0.sql b/htdocs/install/mysql/migration/22.0.0-23.0.0.sql
index 39c4ad26c52..df21c612657 100644
--- a/htdocs/install/mysql/migration/22.0.0-23.0.0.sql
+++ b/htdocs/install/mysql/migration/22.0.0-23.0.0.sql
@@ -320,6 +320,8 @@ ALTER TABLE llx_oauth_token ADD COLUMN expire_at datetime NULL AFTER lastaccess;
 
 ALTER TABLE llx_blockedlog ADD COLUMN linktoref text;
 ALTER TABLE llx_blockedlog DROP FOREIGN KEY fk_linktoref;
+ALTER TABLE llx_blockedlog DROP INDEX fk_linktoref;
+ALTER TABLE llx_blockedlog DROP INDEX idx_linktoref;
 ALTER TABLE llx_blockedlog MODIFY COLUMN linktoref text;
 ALTER TABLE llx_blockedlog ADD COLUMN linktype varchar(16);
 ALTER TABLE llx_blockedlog ADD COLUMN module_source varchar(32) DEFAULT '' AFTER action;