Index: Ringtoets/Common/src/Ringtoets.Common.Data/FailureMechanism/FailureMechanismBase.cs
===================================================================
diff -u -rfec99b77571cc0cf37b60f5ca257394714fde1d7 -r23a37b025a5d0358c1f30fb31de41a2c284519a5
--- Ringtoets/Common/src/Ringtoets.Common.Data/FailureMechanism/FailureMechanismBase.cs	(.../FailureMechanismBase.cs)	(revision fec99b77571cc0cf37b60f5ca257394714fde1d7)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/FailureMechanism/FailureMechanismBase.cs	(.../FailureMechanismBase.cs)	(revision 23a37b025a5d0358c1f30fb31de41a2c284519a5)
@@ -104,7 +104,7 @@
         /// <summary>
         /// Gets all available piping calculations.
         /// </summary>
-        public abstract ICalculationGroup CalculationsGroup { get; protected set; }
+        public abstract CalculationGroup CalculationsGroup { get; protected set; }
 
         public void AddSection(FailureMechanismSection section)
         {