Index: Ringtoets/StabilityPointStructures/src/Ringtoets.StabilityPointStructures.Data/StabilityPointStructuresFailureMechanism.cs
===================================================================
diff -u -rab20c4eb4ca81bd3845d50210d2bdb301177af6a -r183d1e7ed095ea4e8024068bc4ddfcf3ac6997d3
--- Ringtoets/StabilityPointStructures/src/Ringtoets.StabilityPointStructures.Data/StabilityPointStructuresFailureMechanism.cs	(.../StabilityPointStructuresFailureMechanism.cs)	(revision ab20c4eb4ca81bd3845d50210d2bdb301177af6a)
+++ Ringtoets/StabilityPointStructures/src/Ringtoets.StabilityPointStructures.Data/StabilityPointStructuresFailureMechanism.cs	(.../StabilityPointStructuresFailureMechanism.cs)	(revision 183d1e7ed095ea4e8024068bc4ddfcf3ac6997d3)
@@ -56,7 +56,7 @@
         {
             get
             {
-                return CalculationsGroup.GetCalculations().OfType<StructuresCalculation<StabilityPointStructuresInput>>();
+                return CalculationsGroup.GetCalculations().Cast<StructuresCalculation<StabilityPointStructuresInput>>();
             }
         }