--- a/Lib/posixpath.py
+++ b/Lib/posixpath.py
@@ -216,7 +216,8 @@
     beyond that arg is always passed to func.  It can be used, e.g., to pass
     a filename pattern, or a mutable object designed to accumulate
     statistics.  Passing None for arg is common."""
-    warnings.warnpy3k("In 3.x, os.path.walk is removed in favor of os.walk.")
+    warnings.warnpy3k("In 3.x, os.path.walk is removed in favor of os.walk.",
+                      stacklevel=2)
     try:
         names = os.listdir(top)
     except os.error: