diff --git a/interface/wx/ribbon/panel.h b/interface/wx/ribbon/panel.h
index f4fabf56b1..ca83991a55 100644
--- a/interface/wx/ribbon/panel.h
+++ b/interface/wx/ribbon/panel.h
@@ -39,7 +39,7 @@ public:
     */
     wxRibbonPanelEvent(wxEventType command_type = wxEVT_NULL,
                        int win_id = 0,
-                       wxRibbonPanel* panel = NULL)
+                       wxRibbonPanel* panel = NULL);
 
     /**
         Returns the panel relating to this event.