diff --git a/src/msw/textctrl.cpp b/src/msw/textctrl.cpp
index 4282e711fe..c02095d762 100644
--- a/src/msw/textctrl.cpp
+++ b/src/msw/textctrl.cpp
@@ -493,6 +493,10 @@ bool wxTextCtrl::StreamIn(const wxString& value, wxFontEncoding encoding)
     eds.dwCookie = (DWORD)&wpc;
     eds.pfnCallback = wxRichEditStreamIn;
 
+#ifndef SF_UNICODE
+#define SF_UNICODE 0x0010
+#endif
+
     if ( !::SendMessage(GetHwnd(), EM_STREAMIN,
                         SF_TEXT | SF_UNICODE | SFF_SELECTION,
                         (LPARAM)&eds) || eds.dwError )