Index: Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs
===================================================================
diff -u -r34023112e9d57acf92ed6a713d6e2d1df8548098 -r18e230605af8cda1d527525691b2ba9597bf1464
--- Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs	(.../RingtoetsPipingSurfaceLine.cs)	(revision 34023112e9d57acf92ed6a713d6e2d1df8548098)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs	(.../RingtoetsPipingSurfaceLine.cs)	(revision 18e230605af8cda1d527525691b2ba9597bf1464)
@@ -22,6 +22,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Globalization;
 using System.Linq;
 using Core.Common.Base;
 using Core.Common.Base.Data;
@@ -259,10 +260,10 @@
 
             if (!ValidateInRange(l))
             {
-                var outOfRangeMessage = string.Format(Resources.RingtoetsPipingSurfaceLine_0_L_needs_to_be_in_1_2_range,
+                var localRangeL = new Range<double>(LocalGeometry.First().X, LocalGeometry.Last().X);
+                var outOfRangeMessage = string.Format(Resources.RingtoetsPipingSurfaceLine_0_L_needs_to_be_in_Range_1_,
                                                       Resources.RingtoetsPipingSurfaceLine_GetZAtL_Cannot_determine_height,
-                                                      LocalGeometry.First().X,
-                                                      LocalGeometry.Last().X);
+                                                      localRangeL.ToString(FormattableConstants.ShowAtLeastOneDecimal, CultureInfo.CurrentCulture));
                 throw new ArgumentOutOfRangeException(null, outOfRangeMessage);
             }