diff --git a/migrate/db/mysql/ddl_gen.go b/migrate/db/mysql/ddl_gen.go
index 64e46d8..86aab75 100644
--- a/migrate/db/mysql/ddl_gen.go
+++ b/migrate/db/mysql/ddl_gen.go
@@ -186,8 +186,7 @@ func selectCompleted(db *sql.DB) (map[string]struct{}, error) {
 
 var migrationTableCreate = `
 CREATE TABLE IF NOT EXISTS migrations (
- name VARCHAR(255)
-,UNIQUE(name)
+ name VARCHAR(255) PRIMARY KEY AUTO_INCREMENT
 )
 `