diff --git a/utils/fgpanel/FGPanelProtocol.cxx b/utils/fgpanel/FGPanelProtocol.cxx
index 5f8e0e0e9..d11c1c615 100644
--- a/utils/fgpanel/FGPanelProtocol.cxx
+++ b/utils/fgpanel/FGPanelProtocol.cxx
@@ -38,6 +38,7 @@ class PropertySetter {
 public:
   PropertySetter( SGPropertyNode_ptr node ) : _node(node) {}
   virtual void setValue( const char * value ) = 0;
+  virtual ~PropertySetter() {};
 protected:
   SGPropertyNode_ptr _node;
 };