Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Builders/SoilLayer2DTest.cs
===================================================================
diff -u -rcfba2b11da9ac0bb1daf377b8dcb15f7c84e0cfb -rf69d756f50ae1464a1a11f0780b6d6aa646f3114
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Builders/SoilLayer2DTest.cs	(.../SoilLayer2DTest.cs)	(revision cfba2b11da9ac0bb1daf377b8dcb15f7c84e0cfb)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Builders/SoilLayer2DTest.cs	(.../SoilLayer2DTest.cs)	(revision f69d756f50ae1464a1a11f0780b6d6aa646f3114)
@@ -89,8 +89,8 @@
 
             // Assert
             Assert.NotNull(layer.OuterLoop);
-            Assert.AreEqual(new Segment2D(pointA,pointB), layer.OuterLoop[0]);
-            Assert.AreEqual(new Segment2D(pointB,pointA), layer.OuterLoop[1]);
+            Assert.AreEqual(new Segment2D(pointA,pointB), layer.OuterLoop.ElementAt(0));
+            Assert.AreEqual(new Segment2D(pointB,pointA), layer.OuterLoop.ElementAt(1));
         }
 
         [Test]
@@ -112,9 +112,9 @@
 
             // Assert
             Assert.NotNull(layer.OuterLoop);
-            Assert.AreEqual(new Segment2D(pointA,pointB), layer.OuterLoop[0]);
-            Assert.AreEqual(new Segment2D(pointB,pointC), layer.OuterLoop[1]);
-            Assert.AreEqual(new Segment2D(pointC,pointA), layer.OuterLoop[2]);
+            Assert.AreEqual(new Segment2D(pointA, pointB), layer.OuterLoop.ElementAt(0));
+            Assert.AreEqual(new Segment2D(pointB, pointC), layer.OuterLoop.ElementAt(1));
+            Assert.AreEqual(new Segment2D(pointC, pointA), layer.OuterLoop.ElementAt(2));
         }
 
         [Test]