--- a/src/CString_wx.h
+++ b/src/CString_wx.h
@@ -52,7 +52,11 @@ class CString : public wxString{
 		int ReverseFind(const CString& str)const{	return rfind(str);	}
 		CString Right(size_t len)const{	return wxString::Right(len);	}
 		CString Left(size_t len)const{	return wxString::Left(len);	}
+#if wxCHECK_VERSION(2, 9, 0)
+		CString Mid(size_t first, size_t count = wxString::npos)const{
+#else
 		CString Mid(size_t first, size_t count = wxSTRING_MAXLEN)const{
+#endif
 			return wxString::Mid(first, count);
 		}
 };