Index: Ringtoets/Piping/test/Ringtoets.Piping.Calculation.Test/Piping/PipingCalculationTest.cs
===================================================================
diff -u -ra140d91d4a6eb13a999467f3613605b82066e585 -r2208ad67a38ba1b255438ed19d15dca715dfdc43
--- Ringtoets/Piping/test/Ringtoets.Piping.Calculation.Test/Piping/PipingCalculationTest.cs	(.../PipingCalculationTest.cs)	(revision a140d91d4a6eb13a999467f3613605b82066e585)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Calculation.Test/Piping/PipingCalculationTest.cs	(.../PipingCalculationTest.cs)	(revision 2208ad67a38ba1b255438ed19d15dca715dfdc43)
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using NUnit.Framework;
 
@@ -314,7 +315,7 @@
             List<string> validationMessages = calculation.Validate();
 
             // Assert
-            var message = string.Format("The bottomlevel ({0}) of the profile is not deep enough. It must be below at least 0.001 m below the toplevel of the deepest layer ({1}).", bottom, top);
+            var message = string.Format("The bottomlevel ({0}) of the profile is not deep enough. It must be below at least {1} m below the toplevel of the deepest layer ({2}).", bottom, 0.001, top);
             Assert.AreEqual(1, validationMessages.Count);
             Assert.IsTrue(validationMessages.Any(vm => vm.Contains(message)));
         }