diff --git a/interface/wx/html/helpctrl.h b/interface/wx/html/helpctrl.h
index 9b221131c2..0d5bece059 100644
--- a/interface/wx/html/helpctrl.h
+++ b/interface/wx/html/helpctrl.h
@@ -37,7 +37,7 @@
     @see wxBestHelpController, wxHtmlHelpFrame, wxHtmlHelpDialog,
          wxHtmlHelpWindow, wxHtmlModalHelp
 */
-class wxHtmlHelpController
+class wxHtmlHelpController : public wxHelpControllerBase
 {
 public:
     /**