diff --git a/syntheseus/search/node_evaluation/common.py b/syntheseus/search/node_evaluation/common.py
index 8c45c60a..f5d064b2 100644
--- a/syntheseus/search/node_evaluation/common.py
+++ b/syntheseus/search/node_evaluation/common.py
@@ -1,5 +1,7 @@
 """Common node evaluation functions."""
 
+from __future__ import annotations
+
 from collections.abc import Sequence
 
 from syntheseus.search.chem import BackwardReaction