diff --git a/src/freeroute/geometry/tile.py b/src/freeroute/geometry/tile.py
index 2448a3b..7e45ee0 100644
--- a/src/freeroute/geometry/tile.py
+++ b/src/freeroute/geometry/tile.py
@@ -98,9 +98,7 @@ class TileShape:
 
     def contains_tile(self, other: TileShape) -> bool:
         """True if every corner of ``other`` is contained in this shape."""
-        return all(
-            self.contains(other.corner(i)) for i in range(other.border_line_count())
-        )
+        return all(self.contains(other.corner(i)) for i in range(other.border_line_count()))
 
     # --- measures (approximate) --------------------------------------------