diff --git a/sen2chain/cloud_mask.py b/sen2chain/cloud_mask.py
index 490c305913c19fc2025d3f9c559d156c731fa8a6..cb5d68f802367e364135cdb6be3bc93b6663b32c 100755
--- a/sen2chain/cloud_mask.py
+++ b/sen2chain/cloud_mask.py
@@ -3,21 +3,21 @@
 """
 Module for computing cloud-mask from a sen2cor clouds classification raster.
 """
-
 import logging
 import pathlib
 from pathlib import Path
 import pyproj
+import otbApplication
 import shapely.geometry
 from shapely.geometry import box, Polygon, MultiPolygon, GeometryCollection, mapping, shape
 from shapely.ops import transform
 import rasterio
 from rasterio.features import shapes, rasterize
 import numpy as np
+from typing import Mapping, Sequence, AbstractSet, List, Set, Dict, Tuple, Optional, Union
 import gdal
-import otbApplication
+
 # type annotations
-from typing import Mapping, Sequence, AbstractSet, List, Set, Dict, Tuple, Optional, Union
 
 from .config import Config