Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/DesignWaterLevelCalculationActivityTest.cs
===================================================================
diff -u -re1d4d3fe987bfa6504703952ea0dbd8a18f5a698 -r1d540d2625cac50321e2400129af64df6cd21310
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/DesignWaterLevelCalculationActivityTest.cs	(.../DesignWaterLevelCalculationActivityTest.cs)	(revision e1d4d3fe987bfa6504703952ea0dbd8a18f5a698)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/DesignWaterLevelCalculationActivityTest.cs	(.../DesignWaterLevelCalculationActivityTest.cs)	(revision 1d540d2625cac50321e2400129af64df6cd21310)
@@ -30,6 +30,7 @@
 using Ringtoets.Common.Data.Hydraulics;
 using Ringtoets.Common.Data.TestUtil;
 using Ringtoets.Common.Service.MessageProviders;
+using Ringtoets.HydraRing.Calculation.Activities;
 using Ringtoets.HydraRing.Calculation.Calculator.Factory;
 using Ringtoets.HydraRing.Calculation.TestUtil.Calculator;
 
@@ -71,7 +72,7 @@
                                                                    calculationMessageProviderMock);
 
             // Assert
-            Assert.IsInstanceOf<Activity>(activity);
+            Assert.IsInstanceOf<HydraRingActivityBase>(activity);
             Assert.AreSame(activityName, activity.Name);
             Assert.IsNull(activity.ProgressText);
             Assert.AreEqual(ActivityState.None, activity.State);