diff --git a/vcg/complex/algorithms/hole.h b/vcg/complex/algorithms/hole.h
index 064d1807..ecb2256b 100644
--- a/vcg/complex/algorithms/hole.h
+++ b/vcg/complex/algorithms/hole.h
@@ -100,6 +100,8 @@ public:
     ComputeQuality();
     ComputeAngle();
   }
+  // enforce virtual dtor for this class and all subclasses
+  virtual ~TrivialEar() = default;
 
   /// Compute the angle of the two edges of the ear.
   // it tries to make the computation in a precision safe way.
diff --git a/wrap/openfbx/src/ofbx.cpp b/wrap/openfbx/src/ofbx.cpp
index a6e23236..8679bd6d 100644
--- a/wrap/openfbx/src/ofbx.cpp
+++ b/wrap/openfbx/src/ofbx.cpp
@@ -355,7 +355,7 @@ struct Property : IElementProperty
 };
 
 
-struct Element : IElement
+struct Element final : IElement
 {
 	IElement* getFirstChild() const override { return child; }
 	IElement* getSibling() const override { return sibling; }