Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs
===================================================================
diff -u -r7947681ebba776d55c4f78782360256800fa5d1f -r9e6869de553715aefe4752478334c3a6a3f83340
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 7947681ebba776d55c4f78782360256800fa5d1f)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 9e6869de553715aefe4752478334c3a6a3f83340)
@@ -641,7 +641,7 @@
             }
         }
 
-        private static void GenerateClosingStructuresCalculations(ClosingStructuresFailureMechanism failureMechanism, IEnumerable<ClosingStructure> structures, IList<ICalculationBase> calculations)
+        private static void GenerateClosingStructuresCalculations(ClosingStructuresFailureMechanism failureMechanism, IEnumerable<ClosingStructure> structures, List<ICalculationBase> calculations)
         {
             foreach (ClosingStructure structure in structures)
             {