Index: Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/PipingStructureFailureMechanism.cs
===================================================================
diff -u -r802ea30d1fe8fbae93e58dff9ab054dbabca11ae -r0320ab3a413cb6a55e3f615d8c62706a48121588
--- Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/PipingStructureFailureMechanism.cs	(.../PipingStructureFailureMechanism.cs)	(revision 802ea30d1fe8fbae93e58dff9ab054dbabca11ae)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/PipingStructureFailureMechanism.cs	(.../PipingStructureFailureMechanism.cs)	(revision 0320ab3a413cb6a55e3f615d8c62706a48121588)
@@ -33,7 +33,7 @@
     /// </summary>
     public class PipingStructureFailureMechanism : FailureMechanismBase, IHasSectionResults<PipingStructureFailureMechanismSectionResult>
     {
-        private readonly IList<PipingStructureFailureMechanismSectionResult> sectionResults;
+        private readonly List<PipingStructureFailureMechanismSectionResult> sectionResults;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="PipingStructureFailureMechanism"/> class.