Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Data/HeightStructuresFailureMechanism.cs
===================================================================
diff -u -r43b4218e6e71896eb4f3985555258caeb4c7f6f7 -r0320ab3a413cb6a55e3f615d8c62706a48121588
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Data/HeightStructuresFailureMechanism.cs	(.../HeightStructuresFailureMechanism.cs)	(revision 43b4218e6e71896eb4f3985555258caeb4c7f6f7)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Data/HeightStructuresFailureMechanism.cs	(.../HeightStructuresFailureMechanism.cs)	(revision 0320ab3a413cb6a55e3f615d8c62706a48121588)
@@ -36,7 +36,7 @@
     /// </summary>
     public class HeightStructuresFailureMechanism : FailureMechanismBase, ICalculatableFailureMechanism, IHasSectionResults<HeightStructuresFailureMechanismSectionResult>
     {
-        private readonly IList<HeightStructuresFailureMechanismSectionResult> sectionResults;
+        private readonly List<HeightStructuresFailureMechanismSectionResult> sectionResults;
 
         /// <summary>
         /// Creates a new instance of the <see cref="HeightStructuresFailureMechanism"/> class.