diff --git a/manager/views.py b/manager/views.py
index 6524da2..1e45a7d 100644
--- a/manager/views.py
+++ b/manager/views.py
@@ -461,7 +461,7 @@ def makedevice(request):
            network=Network.objects.filter(intip="No VPN")[0],
            organization=Organization.objects.filter(id=device_organization)[0],
            vpnconfig = open(CONFIGDIR + "/files/" + device_serial + ".ovpn").read(),
-           mac = device_mac,
+           mac = device_mac or None,
            changed = timezone.now()
            )