diff --git a/src/helm/benchmark/scenarios/cti_to_mitre_scenario.py b/src/helm/benchmark/scenarios/cti_to_mitre_scenario.py
index a2562e93a5..bf445b403f 100644
--- a/src/helm/benchmark/scenarios/cti_to_mitre_scenario.py
+++ b/src/helm/benchmark/scenarios/cti_to_mitre_scenario.py
@@ -1,7 +1,7 @@
 import os
 import json
 from random import Random
-from typing import Any, List, Dict, Optional
+from typing import Any, List, Dict
 
 import pandas as pd
 from pandas import DataFrame