diff --git a/py/hexagram/dial.py b/py/hexagram/dial.py
index 1bcbc69..3049ff8 100644
--- a/py/hexagram/dial.py
+++ b/py/hexagram/dial.py
@@ -37,8 +37,8 @@ class Dial(Gauge):
         return gradient
 
     def angle(self, value: float):
-        adj     = value - self.min_value
         adj_max = self.max_value - self.min_value
+        adj     = min(adj_max, value - self.min_value)
 
         return self.min_angle + \
             (self.max_angle - self.min_angle) * (adj / adj_max) \