diff --git a/generate-test-data.py b/generate-test-data.py
index 02c9513..c22f1f2 100644
--- a/generate-test-data.py
+++ b/generate-test-data.py
@@ -6,11 +6,13 @@ from config import Config
 
 
 def generate_test_file(fn, delta):
-    subprocess.call(['ffmpeg',
-                     '-f', 'lavfi',
-                     '-i', 'sine=frequency=1000:duration=%d' % delta.total_seconds(),
-                     '-b:a', '%dk' % Config.KBITS,
-                     fn])
+    subprocess.call([
+        'ffmpeg',
+        '-f', 'lavfi',
+        '-i', 'sine=frequency=1000:duration=%d' % delta.total_seconds(),
+        '-b:a', '%dk' % Config.KBITS,
+        fn
+    ])
 
 
 start = datetime.now().replace(minute=0, second=0) - timedelta(hours=3)
diff --git a/prolefeeder.py b/prolefeeder.py
index e4f2e08..bd11054 100644
--- a/prolefeeder.py
+++ b/prolefeeder.py
@@ -110,14 +110,15 @@ def prepare_download(form):
     output_filename = os.path.basename(output_filename)
     attachment_filename = '{}_{}.mp3'.format(form.start_time.data, form.length.data)
 
-    c = ['ffmpeg', '-y']
-    c += ['-ss', str(ss)]
-    c += ['-i', 'concat:' + '|'.join(
-        [os.path.join(app.config['DATA_DIR'], s['fn']) for s in sources])]
-    c += ['-codec', 'copy']
-    c += ['-t', str(form.length.data * 60)]
-    c += [os.path.join(app.config['TMP_DIR'], output_filename)]
-
+    c = [
+        'ffmpeg', '-y',
+        '-ss', str(ss),
+        '-i', 'concat:' + '|'.join(
+            [os.path.join(app.config['DATA_DIR'], s['fn']) for s in sources]),
+        '-codec', 'copy',
+        '-t', str(form.length.data * 60),
+        os.path.join(app.config['TMP_DIR'], output_filename)
+    ]
     app.logger.debug(' '.join(c))
     subprocess.call(c)