Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Plugin/HeightStructuresPlugin.cs
===================================================================
diff -u -rd499bba7f0abdb8481bfe1ffc619414116a13121 -rb2306061789f5e34a6f0994552b4431d01d220f0
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Plugin/HeightStructuresPlugin.cs	(.../HeightStructuresPlugin.cs)	(revision d499bba7f0abdb8481bfe1ffc619414116a13121)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Plugin/HeightStructuresPlugin.cs	(.../HeightStructuresPlugin.cs)	(revision b2306061789f5e34a6f0994552b4431d01d220f0)
@@ -182,7 +182,7 @@
         {
             foreach (var calculation in heightStructuresCalculations)
             {
-                HeightStructuresCalculationService.Validate(calculation, assessmentSection);
+                new HeightStructuresCalculationService().Validate(calculation, assessmentSection);
             }
         }
 
@@ -465,7 +465,7 @@
 
             return builder.AddValidateCalculationItem(
                 context,
-                c => HeightStructuresCalculationService.Validate(c.WrappedData, c.AssessmentSection),
+                c => new HeightStructuresCalculationService().Validate(c.WrappedData, c.AssessmentSection),
                 ValidateAllDataAvailableAndGetErrorMessageForCalculation)
                           .AddPerformCalculationItem(calculation, context, Calculate, ValidateAllDataAvailableAndGetErrorMessageForCalculation)
                           .AddClearCalculationOutputItem(calculation)