--- a/mercurial/changegroup.py	Sat Apr 28 23:01:31 2012 -0700
+++ b/mercurial/changegroup.py	Sun Apr 29 20:58:50 2012 +0200
@@ -118,7 +118,7 @@
     elif alg == 'GZ':
         def generator(f):
             zd = zlib.decompressobj()
-            for chunk in f:
+            for chunk in util.filechunkiter(f):
                 yield zd.decompress(chunk)
     elif alg == 'BZ':
         def generator(f):