diff --git a/deepchem/feat/graph_features.py b/deepchem/feat/graph_features.py
index 82e01e37c0..6469645d08 100644
--- a/deepchem/feat/graph_features.py
+++ b/deepchem/feat/graph_features.py
@@ -690,9 +690,9 @@ def __init__(self, graph_distance=True, explicit_H=False,
     # If uses use_chirality
     self.use_chirality = use_chirality
     if self.use_chirality:
-      self.bt_len = bond_fdim_base + len(possible_bond_stereo)
+      self.bt_len = GraphConvConstants.bond_fdim_base + len(possible_bond_stereo)
     else:
-      self.bt_len = bond_fdim_base
+      self.bt_len = GraphConvConstants.bond_fdim_base
 
   def _featurize(self, mol):
     """Encodes mol as a WeaveMol object."""