diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index 1861664..893d486 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -1588,7 +1588,8 @@
         return self.format == USTAR_FORMAT
     def _setposix(self, value):
         import warnings
-        warnings.warn("use the format attribute instead", DeprecationWarning)
+        warnings.warn("use the format attribute instead", DeprecationWarning,
+                      2)
         if value:
             self.format = USTAR_FORMAT
         else: