ASMX web service soap extension response limited to 65536 bytes

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Basically what I'm trying is redirect requests to an ASMX web service to another ASMX web service. For simplicity's sake let's say I have an ASMX web service with Hello method only and simple soap extension like this one (let's ignore the log entries code). The differences in my soap extension code are:

1) I want to not call the method so at BeforeDeserialize stage I do nothing (i.e. I do not copy oldStream to newStream and do not set newStream.position to 0)

2) at AfterSerialize stage I form response stream from an XML file with proper tags and content and I copy this response stream to oldStream.

It works fine if the size of the XML is less or equal to 65536 bytes. If I add just one more character and size gets increased to 65537 bytes I get error in the client code where I call the Hello method saying "Response is not well-formed XML.". If I still call the method in 1) it works fine but my task is not to call the method. Please note I have ASMX not WCF web service and I have no bindings settings in my web.config. I'm using C# VS 2010 Framework 2 but I get same issue with Framework 4.

How do I change that response size limit?
Thanks in advance.