Index: Lib/gzip.py
===================================================================
--- Lib/gzip.py	(revision 67276)
+++ Lib/gzip.py	(working copy)
@@ -114,7 +114,7 @@
     @property
     def filename(self):
         import warnings
-        warnings.warn("use the name attribute", DeprecationWarning)
+        warnings.warn("use the name attribute", DeprecationWarning, 2)
         if self.mode == WRITE and self.name[-3:] != ".gz":
             return self.name + ".gz"
         return self.name