diff --git a/src/dscom.demo/assembly5/ExplodeyBaseClass.cs b/src/dscom.demo/assembly5/ExplodeyBaseClass.cs
index 1b7e75b..adf3e75 100644
--- a/src/dscom.demo/assembly5/ExplodeyBaseClass.cs
+++ b/src/dscom.demo/assembly5/ExplodeyBaseClass.cs
@@ -4,4 +4,8 @@ namespace dSPACE.Runtime.InteropServices.DemoAssembly5;
 
 public class ExplodeyBaseClass : UserControl
 {
+    private class PrivateImplementationDetails
+    {
+        // required to reproduce #259
+    }
 }