diff --git a/IfcToolbox.Examples/Samples/IfcOptimizerSample.cs b/IfcToolbox.Examples/Samples/IfcOptimizerSample.cs
index 7e57dd3..6e161a7 100644
--- a/IfcToolbox.Examples/Samples/IfcOptimizerSample.cs
+++ b/IfcToolbox.Examples/Samples/IfcOptimizerSample.cs
@@ -4,7 +4,7 @@
 
 namespace IfcToolbox.Examples.Samples
 {
-    class IfcOptimizerSample
+   public class IfcOptimizerSample
     {
         public static void Optimize(string filePath)
         {