diff --git a/include/wx/generic/calctrl.h b/include/wx/generic/calctrl.h
index 25b5902d70..6bd3c75486 100644
--- a/include/wx/generic/calctrl.h
+++ b/include/wx/generic/calctrl.h
@@ -155,6 +155,8 @@ public:
     virtual bool Enable(bool enable = true);
     virtual bool Show(bool show = true);
 
+    virtual void SetWindowStyleFlag(long style);
+
     virtual wxVisualAttributes GetDefaultAttributes() const
         { return GetClassDefaultAttributes(GetWindowVariant()); }