diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index bdf0a1bb0b..fd2a0e4ba5 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -3676,7 +3676,8 @@ void GUI_App::load_gcode(wxWindow* parent, wxString& input_file) const
 
 wxString GUI_App::transition_tridid(int trid_id)
 {
-    wxString maping_dict[8] = { "A", "B", "C", "D", "E", "F", "G" };
+    //wxString maping_dict = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    wxString maping_dict[] = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"};
     int id_index = ceil(trid_id / 4);
     int id_suffix = (trid_id + 1) % 4 == 0 ? 4 : (trid_id + 1) % 4;
     return wxString::Format("%s%d", maping_dict[id_index], id_suffix);