diff --git a/Examples/test-suite/csharp_features.i b/Examples/test-suite/csharp_features.i
index a4cf0f8cb..578a56a10 100644
--- a/Examples/test-suite/csharp_features.i
+++ b/Examples/test-suite/csharp_features.i
@@ -12,6 +12,7 @@ public:
 };
 class Derived : private Base {
 public:
+  virtual ~Derived() {}
   virtual void VirtualMethod() {}
   int variable;
 };
diff --git a/Examples/test-suite/director_primitives.i b/Examples/test-suite/director_primitives.i
index f6542df0d..0842bd200 100644
--- a/Examples/test-suite/director_primitives.i
+++ b/Examples/test-suite/director_primitives.i
@@ -68,7 +68,7 @@ private:
   void delBase() { delete m_base; m_base = 0; }
 public:
   Caller(): m_base(0) {}
-  ~Caller() { delBase(); }
+  virtual ~Caller() { delBase(); }
   void set(Base *b) { delBase(); m_base = b; }
   void reset() { m_base = 0; }
 
diff --git a/Examples/test-suite/using_private.i b/Examples/test-suite/using_private.i
index 6eecd7fc5..be57ef787 100644
--- a/Examples/test-suite/using_private.i
+++ b/Examples/test-suite/using_private.i
@@ -18,6 +18,7 @@ public:
      using Foo::defaulted;
      using Foo::virtualmethod;
      virtual void anothervirtual() {}
+     virtual ~FooBar() {}
 };
 
 %}