diff --git a/sleap/nn/tracking.py b/sleap/nn/tracking.py
index 7889780eb..4b820a17a 100644
--- a/sleap/nn/tracking.py
+++ b/sleap/nn/tracking.py
@@ -3,7 +3,7 @@
 import abc
 import json
 import sys
-from collections import deque, defaultdict
+from collections import deque
 from time import time
 from typing import Callable, Deque, Dict, Iterable, List, Optional, Tuple