diff --git a/net.go b/net.go
index 95180eb..a765020 100644
--- a/net.go
+++ b/net.go
@@ -210,6 +210,9 @@ func (vb *VBox) AddNic(vm *VirtualMachine, nic *NIC) error {
 	}
 
 	args = append(args, fmt.Sprintf("--nictype%d", nic.Index), string(nic.Type))
+	if nic.MAC != "" {
+		args = append(args, fmt.Sprintf("--macaddress%d", nic.Index), nic.MAC)
+	}
 
 	_, err := vb.modify(vm, args...)
 	return err
diff --git a/types.go b/types.go
index ceec014..39f36ff 100644
--- a/types.go
+++ b/types.go
@@ -100,7 +100,7 @@ type NIC struct {
 	Speedkbps       int
 	BootPrio        int
 	PromiscuousMode string
-	MAC             string //auto assigns mac automatically
+	MAC             string
 }
 
 type Network struct {