Index: Ringtoets/Common/src/Ringtoets.Common.Service/WaveHeightCalculationService.cs
===================================================================
diff -u -r915001caffacbbee15c0e3bf449072245bc5f509 -r5cdaf6a62202805aa0abe5636e372a66b1bec723
--- Ringtoets/Common/src/Ringtoets.Common.Service/WaveHeightCalculationService.cs	(.../WaveHeightCalculationService.cs)	(revision 915001caffacbbee15c0e3bf449072245bc5f509)
+++ Ringtoets/Common/src/Ringtoets.Common.Service/WaveHeightCalculationService.cs	(.../WaveHeightCalculationService.cs)	(revision 5cdaf6a62202805aa0abe5636e372a66b1bec723)
@@ -86,7 +86,7 @@
                 calculationName,
                 () =>
                 {
-                    HydraRingCalculationService.PerformCalculation(
+                    HydraRingCalculationService.Instance.PerformCalculation(
                         hlcdDirectory,
                         ringId,
                         HydraRingUncertaintiesType.All,