diff --git a/klippy/kinematics/winch.py b/klippy/kinematics/winch.py
index b5d3c245..942c0545 100644
--- a/klippy/kinematics/winch.py
+++ b/klippy/kinematics/winch.py
@@ -28,7 +28,7 @@ class WinchKinematics:
         for s in self.steppers:
             s.set_max_jerk(max_halt_velocity, max_accel)
         # Setup boundary checks
-        acoords = zip(*self.anchors)
+        acoords = list(zip(*self.anchors))
         self.axes_min = toolhead.Coord(*[min(a) for a in acoords], e=0.)
         self.axes_max = toolhead.Coord(*[max(a) for a in acoords], e=0.)
         self.set_position([0., 0., 0.], ())