diff --git a/py/hexagram/pattern.py b/py/hexagram/pattern.py
index e15e7c9..a9b6100 100644
--- a/py/hexagram/pattern.py
+++ b/py/hexagram/pattern.py
@@ -59,8 +59,8 @@ class HexagonPattern(Pattern):
         super().__init__(self.COMMANDS)
 
     def to_surface(self) -> cairo.RecordingSurface:
-        surface = cairo.RecordingSurface(cairo.Content.COLOR_ALPHA,
-                                         cairo.Rectangle(0, 0, self.WIDTH, self.HEIGHT))
+        rect    = cairo.Rectangle(0, 0, self.WIDTH, self.HEIGHT)
+        surface = cairo.RecordingSurface(cairo.Content.COLOR_ALPHA, rect)
 
         cr = cairo.Context(surface)
         cr.set_source_rgb(*self.COLOR)