diff --git a/migration/migration.go b/migration/migration.go
index c5a9352e..0a140b24 100644
--- a/migration/migration.go
+++ b/migration/migration.go
@@ -80,14 +80,9 @@ func init() {
 	migrationMap = make(map[string]Migrationer)
 }
 
-//DDLSpec implement in the Inheritance struct for defining structure
-func (m *Migration) DDLSpec() {
-
-}
-
 // Up implement in the Inheritance struct for upgrade
 func (m *Migration) Up() {
-	m.DDLSpec()
+
 	switch m.ModifyType {
 	case "reverse":
 		m.ModifyType = "alter"