diff --git a/apdu/command.go b/apdu/command.go
index 1d76f61..81398ec 100644
--- a/apdu/command.go
+++ b/apdu/command.go
@@ -24,7 +24,7 @@ func NewCommand(cla, ins, p1, p2 uint8, data []byte) *Command {
 	}
 }
 
-func (c *Command) serialize() ([]byte, error) {
+func (c *Command) Serialize() ([]byte, error) {
 	buf := new(bytes.Buffer)
 
 	if err := binary.Write(buf, binary.BigEndian, c.Cla); err != nil {
diff --git a/apdu/command_test.go b/apdu/command_test.go
index 2fe13bc..6bfd5ef 100644
--- a/apdu/command_test.go
+++ b/apdu/command_test.go
@@ -37,7 +37,7 @@ func TestNewCommand(t *testing.T) {
 	cmd := NewCommand(cla, ins, p1, p2, data)
 	expected := "80 50 01 02 08 84 76 23 36 C5 18 7F E8 00"
 
-	result, err := cmd.serialize()
+	result, err := cmd.Serialize()
 	assert.NoError(t, err)
 	assert.Equal(t, expected, bytesToHexWithSpaces(result))
 }