[SOLVED] NSNetService delegate and ARC

Performing the following in my app won't call the delegate:

NSNetService * bonjourMonitor;
    bonjourMonitor = [[NSNetService alloc] initWithDomain:@"local." type:@"_device-info._tcp" name:@"My Mac"];
    [bonjourMonitor setDelegate:self];
    [bonjourMonitor startMonitoring];

I am using Automatic Reference Counting. Doing the same without ARC works perfect. NSNetService seams to be released before the delegate has been called.

How can I prevent this from happening?

Thanks a lot!