diff --git a/interface/wx/ribbon/art.h b/interface/wx/ribbon/art.h
index 167f440c3a..d551f3466f 100644
--- a/interface/wx/ribbon/art.h
+++ b/interface/wx/ribbon/art.h
@@ -1251,6 +1251,12 @@ public:
                         wxRect* normal_region,
                         wxRect* dropdown_region);
 
+    wxCoord GetButtonBarButtonTextWidth(
+                        wxDC& dc,
+                        const wxString& label,
+                        wxRibbonButtonKind kind,
+                        wxRibbonButtonBarButtonState size);
+
     wxSize GetMinimisedPanelMinimumSize(
                         wxDC& dc,
                         const wxRibbonPanel* wnd,