diff --git a/src/lerobot/datasets/v30/convert_dataset_v21_to_v30.py b/src/lerobot/datasets/v30/convert_dataset_v21_to_v30.py
index 3ae9093b9..81de05686 100644
--- a/src/lerobot/datasets/v30/convert_dataset_v21_to_v30.py
+++ b/src/lerobot/datasets/v30/convert_dataset_v21_to_v30.py
@@ -228,7 +228,6 @@ def convert_data(root: Path, new_root: Path, data_file_size_in_mb: int):
 
             # Reset for the next file
             size_in_mb = 0
-            num_frames += ep_num_frames  # Still need to accumulate total frames
             paths_to_cat = []
 
         # Now create metadata with correct chunk/file indices