diff --git a/tests/scripts/tiff_cubing.sh b/tests/scripts/tiff_cubing.sh
index 08b1a678d..6e7569b8b 100755
--- a/tests/scripts/tiff_cubing.sh
+++ b/tests/scripts/tiff_cubing.sh
@@ -9,6 +9,7 @@ docker run \
   --jobs 2 \
   --batch_size 8 \
   --layer_name color \
+  --wkw_file_len 32 \
   /testdata/tiff /testoutput/tiff
 [ -d testoutput/tiff/color ]
 [ -d testoutput/tiff/color/1 ]
diff --git a/wkcuber/cubing.py b/wkcuber/cubing.py
index 350ec55f0..1c8f11d0e 100644
--- a/wkcuber/cubing.py
+++ b/wkcuber/cubing.py
@@ -54,6 +54,7 @@ def create_parser():
     parser.add_argument(
         "--wkw_file_len",
         default=32,
+        type=int,
         help="Amount of blocks which are written per dimension to a wkw cube. The default value of 32 means that 1024 slices are written to one cube (since one block has 32**3 voxels by default). For single-channel uint8 data, this results in 1 GB per cube file. If file_len is set to 1, only 32 slices are written to one cube. Must be a power of two.",
     )
 
diff --git a/wkcuber/export_wkw_as_tiff.py b/wkcuber/export_wkw_as_tiff.py
index fd8c118a2..2c6d00af9 100644
--- a/wkcuber/export_wkw_as_tiff.py
+++ b/wkcuber/export_wkw_as_tiff.py
@@ -128,14 +128,17 @@ def export_tiff_slice(
         ],
     ]
 ):
-    batch_number, (
-        tiff_bbox,
-        dest_path,
-        name,
-        dataset_path,
-        tiling_size,
-        batch_size,
-        downsample,
+    (
+        batch_number,
+        (
+            tiff_bbox,
+            dest_path,
+            name,
+            dataset_path,
+            tiling_size,
+            batch_size,
+            downsample,
+        ),
     ) = export_args
     tiff_bbox = tiff_bbox.copy()
     number_of_slices = min(tiff_bbox["size"][2] - batch_number * batch_size, batch_size)
diff --git a/wkcuber/tile_cubing.py b/wkcuber/tile_cubing.py
index 74112a85c..81cb22152 100644
--- a/wkcuber/tile_cubing.py
+++ b/wkcuber/tile_cubing.py
@@ -183,9 +183,16 @@ def find_file_with_dimensions(
 
 
 def tile_cubing_job(args):
-    target_wkw_info, z_batches, input_path_pattern, batch_size, tile_size, min_dimensions, max_dimensions, decimal_lengths = (
-        args
-    )
+    (
+        target_wkw_info,
+        z_batches,
+        input_path_pattern,
+        batch_size,
+        tile_size,
+        min_dimensions,
+        max_dimensions,
+        decimal_lengths,
+    ) = args
     if len(z_batches) == 0:
         return
 
@@ -251,9 +258,12 @@ def tile_cubing(
     target_path, layer_name, dtype, batch_size, input_path_pattern, args=None
 ):
     decimal_lengths = get_digit_counts_for_dimensions(input_path_pattern)
-    min_dimensions, max_dimensions, arbitrary_file, file_count = detect_interval_for_dimensions(
-        input_path_pattern, decimal_lengths
-    )
+    (
+        min_dimensions,
+        max_dimensions,
+        arbitrary_file,
+        file_count,
+    ) = detect_interval_for_dimensions(input_path_pattern, decimal_lengths)
 
     if not arbitrary_file:
         logging.error(