diff --git a/src/lclayout/graphrouter/inspect.py b/src/lclayout/graphrouter/inspect.py
index 2d053c62b66eb6e0f988fc42de3dd4ad69d01653..beabe3fd4aa7661e58d58f71e4b0db91ea96e503 100644
--- a/src/lclayout/graphrouter/inspect.py
+++ b/src/lclayout/graphrouter/inspect.py
@@ -74,7 +74,7 @@ class InspectRouter(GraphRouter):
             assert 0. <= hue <= 1.
 
             a = 2 * math.pi / 3
-            [r,g,b] = [int(255* math.cos(hue*math.pi + i*a) ** 2) for i in range(3)]
+            r,g,b = (int(255* math.cos(hue*math.pi + i*a) ** 2) for i in range(3))
 
             return f"#{r:02x}{g:02x}{b:02x}"