diff --git a/scaner_test.go b/scaner_test.go
index 21410548..cd89ca49 100644
--- a/scaner_test.go
+++ b/scaner_test.go
@@ -3,6 +3,7 @@ package gorm_test
 import (
 	"database/sql/driver"
 	"encoding/json"
+	"errors"
 	"testing"
 )
 
@@ -51,7 +52,14 @@ func (l ExampleStringSlice) Value() (driver.Value, error) {
 }
 
 func (l *ExampleStringSlice) Scan(input interface{}) error {
-	return json.Unmarshal(input.([]byte), l)
+	switch value := input.(type) {
+	case string:
+		return json.Unmarshal([]byte(value), l)
+	case []byte:
+		return json.Unmarshal(value, l)
+	default:
+		return errors.New("not supported")
+	}
 }
 
 type ExampleStruct struct {
@@ -66,5 +74,12 @@ func (l ExampleStructSlice) Value() (driver.Value, error) {
 }
 
 func (l *ExampleStructSlice) Scan(input interface{}) error {
-	return json.Unmarshal(input.([]byte), l)
+	switch value := input.(type) {
+	case string:
+		return json.Unmarshal([]byte(value), l)
+	case []byte:
+		return json.Unmarshal(value, l)
+	default:
+		return errors.New("not supported")
+	}
 }