Index: Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Plugin/StabilityStoneCoverPlugin.cs
===================================================================
diff -u -rf9b49f0ae3953ae90d7ce9d595e61ffa47d4b126 -rce190360da30edf73fb464cc0fea1d9a795aa5d4
--- Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Plugin/StabilityStoneCoverPlugin.cs	(.../StabilityStoneCoverPlugin.cs)	(revision f9b49f0ae3953ae90d7ce9d595e61ffa47d4b126)
+++ Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Plugin/StabilityStoneCoverPlugin.cs	(.../StabilityStoneCoverPlugin.cs)	(revision ce190360da30edf73fb464cc0fea1d9a795aa5d4)
@@ -402,10 +402,10 @@
             }
         }
 
-        private static void GenerateStabilityStoneCoverCalculations(CalculationGroup target, IEnumerable<IHydraulicBoundaryLocation> hydraulicBoundaryLocations)
+        private static void GenerateStabilityStoneCoverCalculations(CalculationGroup target, IEnumerable<HydraulicBoundaryLocation> hydraulicBoundaryLocations)
         {
             StabilityStoneCoverCalculationConfigurationHelper.AddCalculationsFromLocations(
-                hydraulicBoundaryLocations.OfType<HydraulicBoundaryLocation>(),
+                hydraulicBoundaryLocations,
                 target.Children);
         }