diff --git a/aleksis/apps/matrix/models.py b/aleksis/apps/matrix/models.py
index 381d555a26b8d94035670eb78e92ee6eaa4630ee..3cc53698476c0da0849192e63d804edfd35389d3 100644
--- a/aleksis/apps/matrix/models.py
+++ b/aleksis/apps/matrix/models.py
@@ -287,13 +287,19 @@ class MatrixSpace(MatrixRoom):
     def sync_children(self):
         """Sync membership of child spaces and rooms."""
         current_children = self.get_children()
-        child_spaces = MatrixSpace.get_queryset().filter(
-            group__in=self.group.child_groups.filter(child_groups__isnull=False)
-        ).values_list("room_id", flat=True)
-        child_rooms = MatrixRoom.get_queryset().filter(
-            Q(group__in=self.group.child_groups.filter(child_groups__isnull=True))
-            | Q(group=self.group)
-        ).values_list("room_id", flat=True)
+        child_spaces = (
+            MatrixSpace.get_queryset()
+            .filter(group__in=self.group.child_groups.filter(child_groups__isnull=False))
+            .values_list("room_id", flat=True)
+        )
+        child_rooms = (
+            MatrixRoom.get_queryset()
+            .filter(
+                Q(group__in=self.group.child_groups.filter(child_groups__isnull=True))
+                | Q(group=self.group)
+            )
+            .values_list("room_id", flat=True)
+        )
 
         child_ids = list(child_spaces) + list(child_rooms)