diff --git a/dw/tasks/audio_utils.py b/dw/tasks/audio_utils.py
index 42ce9a09..81d5f6b7 100644
--- a/dw/tasks/audio_utils.py
+++ b/dw/tasks/audio_utils.py
@@ -592,7 +592,9 @@ def level_dbfs(waveform, measure="peak"):
     if measure == "peak":
         value = float(numpy.abs(waveform).max())
     else:
-        value = float(numpy.sqrt(numpy.mean(numpy.square(waveform, dtype=numpy.float64))))
+        value = float(
+            numpy.sqrt(numpy.mean(numpy.square(waveform, dtype=numpy.float64)))
+        )
     if value <= 0.0:
         return None
     return 20.0 * numpy.log10(value)
diff --git a/dw/tasks/concat_videos.py b/dw/tasks/concat_videos.py
index 691487e7..829c7698 100644
--- a/dw/tasks/concat_videos.py
+++ b/dw/tasks/concat_videos.py
@@ -91,9 +91,11 @@ def concat_videos(
     # across the whole set, so the last shot's loudness has to be known
     # before the first one is scaled
     waveforms = [
-        as_channels_samples(video.audio)
-        if isinstance(video, AudioVideo) and video.audio is not None
-        else None
+        (
+            as_channels_samples(video.audio)
+            if isinstance(video, AudioVideo) and video.audio is not None
+            else None
+        )
         for video in videos
     ]
     if match_levels: