Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Builders/SoilLayer2D.cs
===================================================================
diff -u -ra3c8c0cb4384de51a18d77cc7bea487f97ba21e1 -rfcc49aac894f989182fb9faa487e50a585fbed03
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Builders/SoilLayer2D.cs	(.../SoilLayer2D.cs)	(revision a3c8c0cb4384de51a18d77cc7bea487f97ba21e1)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Builders/SoilLayer2D.cs	(.../SoilLayer2D.cs)	(revision fcc49aac894f989182fb9faa487e50a585fbed03)
@@ -24,6 +24,8 @@
 using System.Collections.ObjectModel;
 using System.Linq;
 
+using Core.Common.Base.Geometry;
+
 using Ringtoets.Piping.Data;
 using Ringtoets.Piping.Data.Calculation;
 using Ringtoets.Piping.IO.Properties;