diff --git a/worker_generic_training_dataset/utils.py b/worker_generic_training_dataset/utils.py
index 245e5872444353d1c330c99b942adde99a8149ce..47f2bfc44638a46328c9f0551a6c034c69488fd9 100644
--- a/worker_generic_training_dataset/utils.py
+++ b/worker_generic_training_dataset/utils.py
@@ -46,7 +46,7 @@ def download_image(element, folder: Path):
         try:
             image = iio.imread(build_image_url(element))
             cv2.imwrite(
-                str(folder / f"{element.image_id}.jpg"),
+                str(folder / f"{element.image_id}.png"),
                 cv2.cvtColor(image, cv2.COLOR_BGR2RGB),
             )
             break