Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Service/HeightStructuresCalculationService.cs
===================================================================
diff -u -r84db6d79354723db5626dbb9ff7361d2a70d66d1 -r1b9445050ddc7786014349d7014c7c4d85242a5d
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Service/HeightStructuresCalculationService.cs	(.../HeightStructuresCalculationService.cs)	(revision 84db6d79354723db5626dbb9ff7361d2a70d66d1)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Service/HeightStructuresCalculationService.cs	(.../HeightStructuresCalculationService.cs)	(revision 1b9445050ddc7786014349d7014c7c4d85242a5d)
@@ -23,6 +23,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using Core.Common.Base.IO;
 using Core.Common.IO.Exceptions;
 using log4net;
 using Ringtoets.Common.Data.AssessmentSection;