Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/Gml/SerializableEnvelope.cs
===================================================================
diff -u -r17113c2d6dcf27b53e2864b239e048a284bbdf4e -ra2efe01be4b38286eb3d6f17fa3aa865b34ab0f2
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/Gml/SerializableEnvelope.cs	(.../SerializableEnvelope.cs)	(revision 17113c2d6dcf27b53e2864b239e048a284bbdf4e)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/Gml/SerializableEnvelope.cs	(.../SerializableEnvelope.cs)	(revision a2efe01be4b38286eb3d6f17fa3aa865b34ab0f2)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using System.Globalization;
 using System.Xml.Serialization;
 using Core.Common.Base.Geometry;
 
@@ -53,8 +54,8 @@
                 throw new ArgumentNullException(nameof(upperCorner));
             }
 
-            LowerCorner = lowerCorner.X + " " + lowerCorner.Y;
-            UpperCorner = upperCorner.X + " " + upperCorner.Y;
+            LowerCorner = lowerCorner.X.ToString(CultureInfo.InvariantCulture) + " " + lowerCorner.Y.ToString(CultureInfo.InvariantCulture);
+            UpperCorner = upperCorner.X.ToString(CultureInfo.InvariantCulture) + " " + upperCorner.Y.ToString(CultureInfo.InvariantCulture);
         }
 
         /// <summary>
Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableLineString.cs
===================================================================
diff -u -re382cd31f8112438e24bd25ff1c429cf8b5fba4d -ra2efe01be4b38286eb3d6f17fa3aa865b34ab0f2
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableLineString.cs	(.../SerializableLineString.cs)	(revision e382cd31f8112438e24bd25ff1c429cf8b5fba4d)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableLineString.cs	(.../SerializableLineString.cs)	(revision a2efe01be4b38286eb3d6f17fa3aa865b34ab0f2)
@@ -21,6 +21,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Xml.Serialization;
 using Core.Common.Base.Geometry;
@@ -54,7 +55,8 @@
                 throw new ArgumentNullException(nameof(geometry));
             }
 
-            Geometry = geometry.Select(c => c.X + " " + c.Y).Aggregate((c1, c2) => c1 + " " + c2);
+            Geometry = geometry.Select(c => c.X.ToString(CultureInfo.InvariantCulture) + " " + c.Y.ToString(CultureInfo.InvariantCulture))
+                               .Aggregate((c1, c2) => c1 + " " + c2);
         }
 
         /// <summary>
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/Gml/SerializableBoundaryTest.cs
===================================================================
diff -u -rf79dd2e1f821a759c13b3576e09532105789a05d -ra2efe01be4b38286eb3d6f17fa3aa865b34ab0f2
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/Gml/SerializableBoundaryTest.cs	(.../SerializableBoundaryTest.cs)	(revision f79dd2e1f821a759c13b3576e09532105789a05d)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/Gml/SerializableBoundaryTest.cs	(.../SerializableBoundaryTest.cs)	(revision a2efe01be4b38286eb3d6f17fa3aa865b34ab0f2)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using System.Globalization;
 using Core.Common.Base.Geometry;
 using NUnit.Framework;
 using Ringtoets.AssemblyTool.IO.Model.Gml;
@@ -83,8 +84,10 @@
             var boundary = new SerializableBoundary(lowerCorner, upperCorner);
 
             // Assert
-            Assert.AreEqual(lowerCorner.X + " " + lowerCorner.Y, boundary.Envelope.LowerCorner);
-            Assert.AreEqual(upperCorner.X + " " + upperCorner.Y, boundary.Envelope.UpperCorner);
+            Assert.AreEqual(lowerCorner.X.ToString(CultureInfo.InvariantCulture) + " " + lowerCorner.Y.ToString(CultureInfo.InvariantCulture),
+                            boundary.Envelope.LowerCorner);
+            Assert.AreEqual(upperCorner.X.ToString(CultureInfo.InvariantCulture) + " " + upperCorner.Y.ToString(CultureInfo.InvariantCulture),
+                            boundary.Envelope.UpperCorner);
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/Gml/SerializableEnvelopeTest.cs
===================================================================
diff -u -rf79dd2e1f821a759c13b3576e09532105789a05d -ra2efe01be4b38286eb3d6f17fa3aa865b34ab0f2
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/Gml/SerializableEnvelopeTest.cs	(.../SerializableEnvelopeTest.cs)	(revision f79dd2e1f821a759c13b3576e09532105789a05d)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/Gml/SerializableEnvelopeTest.cs	(.../SerializableEnvelopeTest.cs)	(revision a2efe01be4b38286eb3d6f17fa3aa865b34ab0f2)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using System.Globalization;
 using Core.Common.Base.Geometry;
 using NUnit.Framework;
 using Ringtoets.AssemblyTool.IO.Model.Gml;
@@ -86,8 +87,10 @@
             var envelope = new SerializableEnvelope(lowerCorner, upperCorner);
 
             // Assert
-            Assert.AreEqual(lowerCorner.X + " " + lowerCorner.Y, envelope.LowerCorner);
-            Assert.AreEqual(upperCorner.X + " " + upperCorner.Y, envelope.UpperCorner);
+            Assert.AreEqual(lowerCorner.X.ToString(CultureInfo.InvariantCulture) + " " + lowerCorner.Y.ToString(CultureInfo.InvariantCulture),
+                            envelope.LowerCorner);
+            Assert.AreEqual(upperCorner.X.ToString(CultureInfo.InvariantCulture) + " " + upperCorner.Y.ToString(CultureInfo.InvariantCulture),
+                            envelope.UpperCorner);
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableLineStringTest.cs
===================================================================
diff -u -re382cd31f8112438e24bd25ff1c429cf8b5fba4d -ra2efe01be4b38286eb3d6f17fa3aa865b34ab0f2
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableLineStringTest.cs	(.../SerializableLineStringTest.cs)	(revision e382cd31f8112438e24bd25ff1c429cf8b5fba4d)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableLineStringTest.cs	(.../SerializableLineStringTest.cs)	(revision a2efe01be4b38286eb3d6f17fa3aa865b34ab0f2)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using System.Globalization;
 using System.Linq;
 using Core.Common.Base.Geometry;
 using NUnit.Framework;
@@ -75,7 +76,8 @@
 
             // Assert
             Assert.AreEqual("EPSG:28992", lineString.CoordinateSystem);
-            Assert.AreEqual(geometry.Select(c => c.X + " " + c.Y).Aggregate((c1, c2) => c1 + " " + c2), lineString.Geometry);
+            Assert.AreEqual(geometry.Select(c => c.X.ToString(CultureInfo.InvariantCulture) + " " + c.Y.ToString(CultureInfo.InvariantCulture))
+                                    .Aggregate((c1, c2) => c1 + " " + c2), lineString.Geometry);
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableLineTest.cs
===================================================================
diff -u -re382cd31f8112438e24bd25ff1c429cf8b5fba4d -ra2efe01be4b38286eb3d6f17fa3aa865b34ab0f2
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableLineTest.cs	(.../SerializableLineTest.cs)	(revision e382cd31f8112438e24bd25ff1c429cf8b5fba4d)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableLineTest.cs	(.../SerializableLineTest.cs)	(revision a2efe01be4b38286eb3d6f17fa3aa865b34ab0f2)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using System.Globalization;
 using System.Linq;
 using Core.Common.Base.Geometry;
 using NUnit.Framework;
@@ -70,7 +71,8 @@
             var line = new SerializableLine(geometry);
 
             // Assert
-            Assert.AreEqual(geometry.Select(c => c.X + " " + c.Y).Aggregate((c1, c2) => c1 + " " + c2), line.LineString.Geometry);
+            Assert.AreEqual(geometry.Select(c => c.X.ToString(CultureInfo.InvariantCulture) + " " + c.Y.ToString(CultureInfo.InvariantCulture))
+                                    .Aggregate((c1, c2) => c1 + " " + c2), line.LineString.Geometry);
         }
     }
 }
\ No newline at end of file