diff --git a/include/wx/ctrlsub.h b/include/wx/ctrlsub.h
index 61912feb68..118a212c70 100644
--- a/include/wx/ctrlsub.h
+++ b/include/wx/ctrlsub.h
@@ -286,7 +286,7 @@ public:
     // deleting items
     // --------------
 
-    void Clear();
+    virtual void Clear();
     void Delete(unsigned int pos);