Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs
===================================================================
diff -u -r964f8948f0ec59095ea9cc58fdabd706c4b17d22 -r0320ab3a413cb6a55e3f615d8c62706a48121588
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 964f8948f0ec59095ea9cc58fdabd706c4b17d22)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 0320ab3a413cb6a55e3f615d8c62706a48121588)
@@ -368,7 +368,7 @@
             };
         }
 
-        private static IEnumerable GetInputs(ClosingStructuresFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
+        private static IList GetInputs(ClosingStructuresFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
         {
             return new ArrayList
             {
@@ -379,7 +379,7 @@
             };
         }
 
-        private static IEnumerable GetOutputs(ClosingStructuresFailureMechanism failureMechanism)
+        private static IList GetOutputs(ClosingStructuresFailureMechanism failureMechanism)
         {
             return new ArrayList
             {