diff --git a/py/mazebase/items/terrain.py b/py/mazebase/items/terrain.py
index 248ff82..3b7e6bc 100644
--- a/py/mazebase/items/terrain.py
+++ b/py/mazebase/items/terrain.py
@@ -120,7 +120,7 @@ def toggle(self):
 
     def featurize(self):
         return super(Door, self).featurize() + \
-            ["open" if self.open else "closed", self.STATE_FEATURE[self.state]]
+            ["open" if self.isopen else "closed", self.STATE_FEATURE[self.state]]
 
     @classmethod
     def all_features(cls):