diff --git a/chainladder/development/development.py b/chainladder/development/development.py
index 33b9301c..e7b18a79 100644
--- a/chainladder/development/development.py
+++ b/chainladder/development/development.py
@@ -211,7 +211,7 @@ def transform(self, X):
             "w_v2_",
         ]
         for item in triangles:
-            setattr(X_new, item, getattr(self, item), None)
+            setattr(X_new, item, getattr(self, item, None))
 
         X_new._set_slicers()