Index: Ringtoets/Common/src/Ringtoets.Common.Utils/RingtoetsVersionComparer.cs
===================================================================
diff -u -r24fff72c73f0e43ad9f9fcf3a616ab0f8f96e077 -re6eb1a39ca98a5cf0671bcf4326f0e79104c64b1
--- Ringtoets/Common/src/Ringtoets.Common.Utils/RingtoetsVersionComparer.cs	(.../RingtoetsVersionComparer.cs)	(revision 24fff72c73f0e43ad9f9fcf3a616ab0f8f96e077)
+++ Ringtoets/Common/src/Ringtoets.Common.Utils/RingtoetsVersionComparer.cs	(.../RingtoetsVersionComparer.cs)	(revision e6eb1a39ca98a5cf0671bcf4326f0e79104c64b1)
@@ -22,6 +22,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 
 namespace Ringtoets.Common.Utils
@@ -35,7 +36,7 @@
 
         public int Compare(object x, object y)
         {
-            return Compare(x.ToString(), y.ToString());
+            return Compare(GetFormattableString(x), GetFormattableString(y));
         }
 
         public int Compare(string x, string y)
@@ -81,5 +82,11 @@
             }
             return compareTo;
         }
+
+        private static string GetFormattableString(object formattableObject)
+        {
+            var formattable = formattableObject as IFormattable;
+            return formattable?.ToString(null, CultureInfo.InvariantCulture) ?? formattableObject.ToString();
+        }
     }
 }
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