diff --git a/tests/migrate_test.go b/tests/migrate_test.go
index 6b5554eb..7c1fa514 100644
--- a/tests/migrate_test.go
+++ b/tests/migrate_test.go
@@ -1108,7 +1108,7 @@ func (mm mockMigrator) AlterColumn(dst interface{}, field string) error {
 	if err != nil {
 		return err
 	}
-	return fmt.Errorf("trigger alter column error, field:%s", field)
+	return fmt.Errorf("trigger alter column error, field: %s", field)
 }
 
 type mockDialector struct {