diff --git a/include/wx/motif/msgdlg.h b/include/wx/motif/msgdlg.h
index 4275fa2874..dfb16cbf2f 100644
--- a/include/wx/motif/msgdlg.h
+++ b/include/wx/motif/msgdlg.h
@@ -51,12 +51,5 @@ protected:
     long        m_result;
 };
 
-
-int WXDLLEXPORT wxMessageBox(const wxString& message,
-                             const wxString& caption = wxMessageBoxCaptionStr,
-                             long style = wxOK | wxCENTRE,
-                             wxWindow *parent = NULL,
-                             int x = -1, int y = -1);
-
 #endif
     // _WX_MSGBOXDLG_H_