diff --git a/fhem/FHEM/37_fakeRoku.pm b/fhem/FHEM/37_fakeRoku.pm
index 7a673aad0..85c3a259d 100644
--- a/fhem/FHEM/37_fakeRoku.pm
+++ b/fhem/FHEM/37_fakeRoku.pm
@@ -521,8 +521,8 @@ fakeRoku_Parse($$;$$$)
                                                       modelName => ['FHEM'],
                                                     modelNumber => ['4200X'],
                                                        modelURL => ['http://www.fhem.de/'],
-                                                   serialNumber => [$hash->{serial}],
-                                                            UDN => ["uuid:roku:ecp:$hash->{serial}"],
+                                                   serialNumber => [AttrVal($name,'serial',$hash->{helper}{serial})],
+                                                            UDN => ["uuid:roku:ecp:".AttrVal($name,'serial',$hash->{helper}{serial})],
                                                     serviceList => [ { service => [ { serviceType => ['urn:roku-com:service:ecp:1'],
                                                                                         serviceId => ['urn:roku-com:serviceId:ecp1-0'],
                                                                                        controlURL => [''],