diff --git a/pi/models.py b/pi/models.py
index 210d8d9..fbdf6c6 100644
--- a/pi/models.py
+++ b/pi/models.py
@@ -66,4 +66,4 @@ class PiLog(models.Model):
     @property
     def hit(self):
         """Return if this log entry is inside the unit circle."""
-        return math.hypot(self.simulation_x, self.simulation.y) < 1
+        return math.hypot(self.simulation_x, self.simulation_y) < 1