diff --git a/benchmark/problem_stats.py b/benchmark/problem_stats.py
index 06c9caf0a..e147fb4b8 100755
--- a/benchmark/problem_stats.py
+++ b/benchmark/problem_stats.py
@@ -4,7 +4,6 @@ import argparse
 import json
 from collections import defaultdict
 from pathlib import Path
-from typing import List, Optional
 
 import yaml