diff --git a/tracklab/configs/dataset/mot17.yaml b/tracklab/configs/dataset/mot17.yaml
index c0adc349..26d7642e 100644
--- a/tracklab/configs/dataset/mot17.yaml
+++ b/tracklab/configs/dataset/mot17.yaml
@@ -10,3 +10,4 @@ public_dets_subpath: "det/yolox_dets.txt"  # det.txt for public and yolox.txt fo
 track_eval:
   dataset_class: MotChallenge2DBox
   BENCHMARK: "MOT17"
+  DO_PREPROC: True
diff --git a/tracklab/configs/dataset/mot20.yaml b/tracklab/configs/dataset/mot20.yaml
index 1c429b58..1e768992 100644
--- a/tracklab/configs/dataset/mot20.yaml
+++ b/tracklab/configs/dataset/mot20.yaml
@@ -10,3 +10,4 @@ public_dets_subpath: "det/yolox_dets.txt"  # det.txt for public and yolox.txt fo
 track_eval:
   dataset_class: MotChallenge2DBox
   BENCHMARK: "MOT20"
+  DO_PREPROC: True