diff --git a/src/cdmriddir.h b/src/cdmriddir.h
index 23334e3..ae33774 100644
--- a/src/cdmriddir.h
+++ b/src/cdmriddir.h
@@ -50,7 +50,7 @@ public:
     CDmridDir();
     
     // destructor
-    ~CDmridDir();
+    virtual ~CDmridDir();
     
     // init & close
     virtual bool Init(void);