Index: Ringtoets/Common/src/Ringtoets.Common.Service/WaveHeightCalculationActivity.cs
===================================================================
diff -u -r8aea6e032ff8aeb4a4f1b85210fd0e2fbbce3a4a -r1e533850c7711172462df1e8f569b9f3ff950045
--- Ringtoets/Common/src/Ringtoets.Common.Service/WaveHeightCalculationActivity.cs	(.../WaveHeightCalculationActivity.cs)	(revision 8aea6e032ff8aeb4a4f1b85210fd0e2fbbce3a4a)
+++ Ringtoets/Common/src/Ringtoets.Common.Service/WaveHeightCalculationActivity.cs	(.../WaveHeightCalculationActivity.cs)	(revision 1e533850c7711172462df1e8f569b9f3ff950045)
@@ -82,11 +82,11 @@
                 return;
             }
 
-            PerformRun(() => WaveHeightCalculationService.Validate(
+            PerformRun(() => WaveHeightCalculationService.Instance.Validate(
                 messageProvider.GetCalculationName(hydraulicBoundaryLocation.Name),
                 hydraulicBoundaryDatabaseFilePath),
                        () => hydraulicBoundaryLocation.WaveHeight = (RoundedDouble) double.NaN,
-                       () => WaveHeightCalculationService.Calculate(
+                       () => WaveHeightCalculationService.Instance.Calculate(
                            messageProvider, hydraulicBoundaryLocation, hydraulicBoundaryDatabaseFilePath,
                            ringId, norm));
         }