diff --git a/include/wx/gtk/msgdlg.h b/include/wx/gtk/msgdlg.h
index 6e74529d83..ddc15961ce 100644
--- a/include/wx/gtk/msgdlg.h
+++ b/include/wx/gtk/msgdlg.h
@@ -38,7 +38,6 @@ private:
     wxString m_caption;
     wxString m_message;
     long m_dialogStyle;
-    wxWindow *m_parent;
 
     DECLARE_DYNAMIC_CLASS(wxMessageDialog)
 };
diff --git a/include/wx/gtk1/msgdlg.h b/include/wx/gtk1/msgdlg.h
index 6e74529d83..ddc15961ce 100644
--- a/include/wx/gtk1/msgdlg.h
+++ b/include/wx/gtk1/msgdlg.h
@@ -38,7 +38,6 @@ private:
     wxString m_caption;
     wxString m_message;
     long m_dialogStyle;
-    wxWindow *m_parent;
 
     DECLARE_DYNAMIC_CLASS(wxMessageDialog)
 };