Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanism.cs
===================================================================
diff -u -r43b4218e6e71896eb4f3985555258caeb4c7f6f7 -r0320ab3a413cb6a55e3f615d8c62706a48121588
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanism.cs	(.../PipingFailureMechanism.cs)	(revision 43b4218e6e71896eb4f3985555258caeb4c7f6f7)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingFailureMechanism.cs	(.../PipingFailureMechanism.cs)	(revision 0320ab3a413cb6a55e3f615d8c62706a48121588)
@@ -33,7 +33,7 @@
     /// </summary>
     public class PipingFailureMechanism : FailureMechanismBase, ICalculatableFailureMechanism, IHasSectionResults<PipingFailureMechanismSectionResult>
     {
-        private readonly IList<PipingFailureMechanismSectionResult> sectionResults;
+        private readonly List<PipingFailureMechanismSectionResult> sectionResults;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="PipingFailureMechanism"/> class.