diff --git a/src/plugins/wmf/samplegrabber.h b/src/plugins/wmf/samplegrabber.h
index 7a5c2260..63cb5fa6 100644
--- a/src/plugins/wmf/samplegrabber.h
+++ b/src/plugins/wmf/samplegrabber.h
@@ -72,6 +72,9 @@ public:
 protected:
     SampleGrabberCallback() : m_cRef(1) {}
 
+public:
+    virtual ~SampleGrabberCallback() {}
+
 private:
     long m_cRef;
 };