diff --git a/wolframalpha/__init__.py b/wolframalpha/__init__.py
index 047df90..e19f87c 100644
--- a/wolframalpha/__init__.py
+++ b/wolframalpha/__init__.py
@@ -75,7 +75,7 @@ class Result(object):
         return iter(self.info)
     
     def __len__(self):
-        return len(self.tree)
+        return len(self.info)
     
     @property
     def results(self):