diff -r 64640a02b0ca Lib/gzip.py
--- a/Lib/gzip.py	Mon Aug 27 10:03:23 2012 +0300
+++ b/Lib/gzip.py	Tue Aug 28 23:32:23 2012 +0300
@@ -670,9 +670,9 @@
             if not chunk:
                 break
             g.write(chunk)
-        if g is not sys.stdout:
+        if g is not sys.stdout.buffer:
             g.close()
-        if f is not sys.stdin:
+        if f is not sys.stdin.buffer:
             f.close()
 
 if __name__ == '__main__':