Index: Ringtoets/Common/src/Ringtoets.Common.Forms/GuiServices/HydraulicBoundaryLocationCalculationGuiService.cs
===================================================================
diff -u -rf8c28b3b04cdabb62ea37772efcb1f4ebbbf2b9e -r0320ab3a413cb6a55e3f615d8c62706a48121588
--- Ringtoets/Common/src/Ringtoets.Common.Forms/GuiServices/HydraulicBoundaryLocationCalculationGuiService.cs	(.../HydraulicBoundaryLocationCalculationGuiService.cs)	(revision f8c28b3b04cdabb62ea37772efcb1f4ebbbf2b9e)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/GuiServices/HydraulicBoundaryLocationCalculationGuiService.cs	(.../HydraulicBoundaryLocationCalculationGuiService.cs)	(revision 0320ab3a413cb6a55e3f615d8c62706a48121588)
@@ -105,7 +105,7 @@
                                                                                                 messageProvider)).ToArray());
         }
 
-        private bool RunActivities<TActivity>(string hydraulicBoundaryDatabasePath, IList<TActivity> activities) where TActivity : Activity
+        private bool RunActivities<TActivity>(string hydraulicBoundaryDatabasePath, IEnumerable<TActivity> activities) where TActivity : Activity
         {
             string validationProblem = HydraulicBoundaryDatabaseHelper.ValidatePathForCalculation(hydraulicBoundaryDatabasePath);
             if (string.IsNullOrEmpty(validationProblem))