Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Service/HeightStructuresCalculationActivity.cs
===================================================================
diff -u -rab20c4eb4ca81bd3845d50210d2bdb301177af6a -r16cb360eae0014270ebb6700054afdbbd565ae65
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Service/HeightStructuresCalculationActivity.cs	(.../HeightStructuresCalculationActivity.cs)	(revision ab20c4eb4ca81bd3845d50210d2bdb301177af6a)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Service/HeightStructuresCalculationActivity.cs	(.../HeightStructuresCalculationActivity.cs)	(revision 16cb360eae0014270ebb6700054afdbbd565ae65)
@@ -81,7 +81,7 @@
 
         protected override bool Validate()
         {
-            return calculationService.Validate(calculation, assessmentSection);
+            return HeightStructuresCalculationService.Validate(calculation, assessmentSection);
         }
 
         protected override void PerformCalculation()