diff --git a/plinth/modules/backups/views.py b/plinth/modules/backups/views.py
index be58772e1..91fda6fdd 100644
--- a/plinth/modules/backups/views.py
+++ b/plinth/modules/backups/views.py
@@ -157,7 +157,8 @@ class UploadArchiveView(SuccessMessageMixin, FormView):
             # - For restoring it's highly advisable to have at least as much
             #   free disk space as the file size.
             context['max_filesize'] = storage.format_bytes(
-                    disk_info["free_bytes"] / 2)
+                disk_info['free_bytes'] / 2)
+
         return context
 
     def form_valid(self, form):
@@ -242,12 +243,13 @@ class RestoreArchiveView(BaseRestoreView):
 
 class DownloadArchiveView(View):
     """View to export and download an archive as stream."""
+
     def get(self, request, uuid, name):
         repository = get_repository(uuid)
         filename = "%s.tar.gz" % name
 
-        response = StreamingHttpResponse(repository.get_zipstream(name),
-                                         content_type="application/x-gzip")
+        response = StreamingHttpResponse(
+            repository.get_zipstream(name), content_type='application/x-gzip')
         response['Content-Disposition'] = 'attachment; filename="%s"' % \
             filename
         return response
@@ -293,8 +295,9 @@ class RemoveRepositoryView(SuccessMessageMixin, TemplateView):
         """Delete the archive."""
         repository = SshBorgRepository(uuid, automount=False)
         repository.remove_repository()
-        messages.success(request, _('Repository removed. The remote backup '
-                                    'itself was not deleted.'))
+        messages.success(
+            request,
+            _('Repository removed. The remote backup itself was not deleted.'))
         return redirect('backups:index')
 
 
diff --git a/plinth/modules/storage/__init__.py b/plinth/modules/storage/__init__.py
index 3a4c0fc54..7f1d90463 100644
--- a/plinth/modules/storage/__init__.py
+++ b/plinth/modules/storage/__init__.py
@@ -153,9 +153,9 @@ def get_disk_info(mount_point):
     free_bytes = list_root[0]['free']
     free_gib = free_bytes / (1024**3)
     return {
-        "percent_used": percent_used,
-        "free_bytes": free_bytes,
-        "free_gib": free_gib
+        'percent_used': percent_used,
+        'free_bytes': free_bytes,
+        'free_gib': free_gib
     }
 
 
diff --git a/plinth/modules/storage/views.py b/plinth/modules/storage/views.py
index 78f3a5b5e..5afd5b922 100644
--- a/plinth/modules/storage/views.py
+++ b/plinth/modules/storage/views.py
@@ -105,12 +105,12 @@ def warn_about_low_disk_space(request):
         # Translators: xgettext:no-python-format
         _('Warning: Low space on system partition ({percent_used}% used, '
           '{free_space} free).'),
-        percent_used=root_info["percent_used"],
-        free_space=storage.format_bytes(root_info["free_bytes"]))
+        percent_used=root_info['percent_used'],
+        free_space=storage.format_bytes(root_info['free_bytes']))
 
-    if root_info["percent_used"] > 90 or root_info["free_gib"] < 1:
+    if root_info['percent_used'] > 90 or root_info['free_gib'] < 1:
         messages.error(request, message)
-    elif root_info["percent_used"] > 75 or root_info["free_gib"] < 2:
+    elif root_info['percent_used'] > 75 or root_info['free_gib'] < 2:
         messages.warning(request, message)