diff --git a/Examples/test-suite/using_extend_flatten.i b/Examples/test-suite/using_extend_flatten.i
index a7bd7a788..55b1c7a9c 100644
--- a/Examples/test-suite/using_extend_flatten.i
+++ b/Examples/test-suite/using_extend_flatten.i
@@ -15,6 +15,7 @@ public:
     void one();
     virtual void two();
     virtual void three();
+    virtual ~ExtendBase() {}
 };
 
 class ExtendDerived : public ExtendBase