diff --git a/lattice2LinearArray.py b/lattice2LinearArray.py
index 7902d52..d68304e 100644
--- a/lattice2LinearArray.py
+++ b/lattice2LinearArray.py
@@ -128,8 +128,10 @@ class LinearArray(lattice2BaseFeature.LatticeFeature):
                 raise ValueError('Axis link must be a line; it is '+type(linkedShape.Curve)+' instead.')
             
             #obtain
-            dir = linkedShape.Curve.EndPoint - linkedShape.Curve.StartPoint
-            point = linkedShape.Curve.StartPoint if not obj.Reverse else linkedShape.Curve.EndPoint
+            start_point = linkedShape.valueAt(linkedShape.FirstParameter)
+            end_point = linkedShape.valueAt(linkedShape.LastParameter)
+            dir = end_point - start_point
+            point = start_point if not obj.Reverse else end_point
             
             if obj.DirIsDriven:
                 obj.Dir = dir
diff --git a/lattice2PolarArray.py b/lattice2PolarArray.py
index c4943c8..defbbcd 100644
--- a/lattice2PolarArray.py
+++ b/lattice2PolarArray.py
@@ -123,7 +123,9 @@ class PolarArray(lattice2BaseFeature.LatticeFeature):
             dir = App.Vector()
             point = App.Vector()
             if isinstance(linkedShape.Curve, Part.Line):
-                dir = linkedShape.Curve.EndPoint - linkedShape.Curve.StartPoint
+                start_point = linkedShape.valueAt(linkedShape.FirstParameter)
+                end_point = linkedShape.valueAt(linkedShape.LastParameter)
+                dir = end_point - start_point
                 point = linkedShape.Curve.StartPoint
             elif isinstance(linkedShape.Curve, Part.Circle):
                 dir = linkedShape.Curve.Axis