Index: Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs
===================================================================
diff -u -r81fa8a9bf3bd503cbd280e88b8f6037a840cff12 -r5c348ad608dfd7af011130adf085ed0cc8272730
--- Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs	(.../RingtoetsPipingSurfaceLine.cs)	(revision 81fa8a9bf3bd503cbd280e88b8f6037a840cff12)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs	(.../RingtoetsPipingSurfaceLine.cs)	(revision 5c348ad608dfd7af011130adf085ed0cc8272730)
@@ -132,7 +132,7 @@
             {
                 throw new ArgumentException(Resources.RingtoetsPipingSurfaceLine_A_point_in_the_collection_was_null);
             }
-            Points = points.ToArray();
+            Points = points.Select(p => new Point3D(p.X, p.Y, p.Z)).ToArray();
 
             if (Points.Length > 0)
             {
@@ -368,7 +368,8 @@
             }
 
             Name = fromSurfaceLine.Name;
-            ReferenceLineIntersectionWorldPoint = fromSurfaceLine.ReferenceLineIntersectionWorldPoint;
+            ReferenceLineIntersectionWorldPoint = new Point2D(fromSurfaceLine.ReferenceLineIntersectionWorldPoint.X,
+                                                              fromSurfaceLine.ReferenceLineIntersectionWorldPoint.Y);
             SetGeometry(fromSurfaceLine.Points);
             ClearCharacteristicPoints();
             SetCharacteristicPoints(fromSurfaceLine);