diff --git a/include/wx/sizer.h b/include/wx/sizer.h
index 1aae6d573c..c38c47a0ef 100644
--- a/include/wx/sizer.h
+++ b/include/wx/sizer.h
@@ -622,7 +622,7 @@ class WXDLLEXPORT wxStaticBoxSizer: public wxBoxSizer
 {
 public:
     wxStaticBoxSizer(wxStaticBox *box, int orient);
-    wxStaticBoxSizer(int orient, wxWindow *win, const wxString& label = _T(""));
+    wxStaticBoxSizer(int orient, wxWindow *win, const wxString& label = wxEmptyString);
 
     void RecalcSizes();
     wxSize CalcMin();