diff --git a/vala/gvala/gvala.vala b/vala/gvala/gvala.vala
index 7dac9d3..92a2fbe 100644
--- a/vala/gvala/gvala.vala
+++ b/vala/gvala/gvala.vala
@@ -10,11 +10,17 @@ class Sub : Base {
   }
 }
 
+class SubSub : Sub {
+  public override void copy () {
+    stdout.printf ("SubSub copy() called\n");
+  }
+}
+
 class GVala : GLib.Object {
   public static int main (string[] args) {
     // var base = new Base();
     // var sub = new Sub();
-    Base b = new Sub();
+    Base b = new SubSub();
 
     b.copy();