Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs
===================================================================
diff -u -rab20c4eb4ca81bd3845d50210d2bdb301177af6a -r16cb360eae0014270ebb6700054afdbbd565ae65
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision ab20c4eb4ca81bd3845d50210d2bdb301177af6a)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 16cb360eae0014270ebb6700054afdbbd565ae65)
@@ -343,7 +343,7 @@
         {
             foreach (var calculation in closingStructuresCalculations)
             {
-                new ClosingStructuresCalculationService().Validate(calculation, assessmentSection);
+                ClosingStructuresCalculationService.Validate(calculation, assessmentSection);
             }
         }
 
@@ -501,7 +501,7 @@
 
             return builder.AddValidateCalculationItem(
                 context,
-                c => new ClosingStructuresCalculationService().Validate(c.WrappedData, c.AssessmentSection),
+                c => ClosingStructuresCalculationService.Validate(c.WrappedData, c.AssessmentSection),
                 ValidateAllDataAvailableAndGetErrorMessageForCalculation)
                           .AddPerformCalculationItem(calculation, context, Calculate, ValidateAllDataAvailableAndGetErrorMessageForCalculation)
                           .AddClearCalculationOutputItem(calculation)