diff --git a/orix/quaternion/symmetry.py b/orix/quaternion/symmetry.py
index 00385773..1e940255 100644
--- a/orix/quaternion/symmetry.py
+++ b/orix/quaternion/symmetry.py
@@ -417,7 +417,7 @@ def get_axis_orders(self) -> Dict[Vector3d, int]:
     def get_highest_order_axis(self) -> Tuple[Vector3d, np.ndarray]:
         axis_orders = self.get_axis_orders()
         if len(axis_orders) == 0:
-            return Vector3d.zvector(), np.infty
+            return Vector3d.zvector(), np.inf
         highest_order = max(axis_orders.values())
         axes = Vector3d.stack(
             [ao for ao in axis_orders if axis_orders[ao] == highest_order]