diff --git a/ceilometer/transformer/__init__.py b/ceilometer/transformer/__init__.py
index e69f9f7f..3df6d7f3 100644
--- a/ceilometer/transformer/__init__.py
+++ b/ceilometer/transformer/__init__.py
@@ -89,3 +89,4 @@ class Namespace(object):
 
     def __nonzero__(self):
         return len(self.__dict__) > 0
+    __bool__ = __nonzero__