Linker Stripping Out Serialization

I've been using the following bit of code for years to save simple objects local storage.

using (FileStream fs = new FileStream(filename, FileMode.Create))
{
      DataContractSerializer dcs = new DataContractSerializer(typeof(T));
      dcs.WriteObject(fs, Object);
}

After the latest set of Xamarin updates this stopped working on Android when built in release mode. It still works on iOS and it works on Android if I turn off all linking. However, if I "link SDK Assemblies only" I get errors the following:

• Missing Method Exception : Constructor on Type 'System.Runtime.Serialization.CollectionDataContract' Not Found.

Is there a way for me to force this to link correctly?