diff --git a/sleap/nn/tracking.py b/sleap/nn/tracking.py
index d14169119..dc2f0a367 100644
--- a/sleap/nn/tracking.py
+++ b/sleap/nn/tracking.py
@@ -653,10 +653,7 @@ def infer_next_timestep(self, t: Optional[int] = None) -> int:
                 self.track_matching_queue_dict,
                 key=lambda track: len(self.track_matching_queue_dict[track]),
             )
-            return (
-                self.track_matching_queue_dict[track_with_max_instances][-1].t
-                + 1
-            )
+            return 1 + self.track_matching_queue_dict[track_with_max_instances][-1].t
 
         # Default to last timestep + 1 if available.
         if not self.has_max_tracking and len(self.track_matching_queue) > 0:
@@ -1521,7 +1518,9 @@ def run_tracker(frames: List[LabeledFrame], tracker: BaseTracker) -> List[Labele
     # Run tracking on every frame
     for lf in frames:
         # Use only the predicted instances
-        instances = [inst for inst in lf.instances if isinstance(inst, PredictedInstance)]
+        instances = [
+            inst for inst in lf.instances if isinstance(inst, PredictedInstance)
+        ]
 
         # Clear the tracks
         for inst in instances: