Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Plugin/HeightStructuresPlugin.cs
===================================================================
diff -u -r026cc14e6eb321e7e3e1c16d2e278cab74602339 -r58e63d129c58c0247ce8918486f4e68120876bd9
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Plugin/HeightStructuresPlugin.cs	(.../HeightStructuresPlugin.cs)	(revision 026cc14e6eb321e7e3e1c16d2e278cab74602339)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Plugin/HeightStructuresPlugin.cs	(.../HeightStructuresPlugin.cs)	(revision 58e63d129c58c0247ce8918486f4e68120876bd9)
@@ -35,6 +35,7 @@
 using Ringtoets.Common.Data.Probability;
 using Ringtoets.Common.Data.Structures;
 using Ringtoets.Common.Forms;
+using Ringtoets.Common.Forms.ChangeHandlers;
 using Ringtoets.Common.Forms.Helpers;
 using Ringtoets.Common.Forms.PresentationObjects;
 using Ringtoets.Common.Forms.TreeNodeInfos;