Nodejs zlib throwing a no method error

I just installed the ebay-api package through npm. One of it's dependencies is restler and it's throwing an error that I can't seem to fix.

TypeError: Object #<Object> has no method 'gunzip'
    at IncomingMessage.<anonymous> (node_modules/restler/lib/restler.js:428:10)
    at EventEmitter._decode (node_modules/restler/lib/restler.js:161:25)
    at IncomingMessage.<anonymous> (node_modules/restler/lib/restler.js:140:14)
    at IncomingMessage.emit (events.js:88:20)
    at HTTPParser.onMessageComplete (http.js:137:23)
    at CleartextStream.ondata (http.js:1125:24)
    at CleartextStream._push (tls.js:363:27)
    at SecurePair.cycle (tls.js:679:20)
    at EncryptedStream.write (tls.js:122:13)
    at Socket.ondata (stream.js:38:26)

Line 428 is:

    zlib.gunzip(buf, callback);

I'm running node v0.5.11-pre and the most up-to-date restler install as well. Any help here would be greatly appreciated.