diff --git a/backend_tcl/demo/demo.tcl b/backend_tcl/demo/demo.tcl
index 96c1a4cb..08f4cb48 100644
--- a/backend_tcl/demo/demo.tcl
+++ b/backend_tcl/demo/demo.tcl
@@ -1,4 +1,5 @@
 package require Tk
+lappend auto_path [file normalize [file dirname [info script]]/..]
 package require zint
 wm title . "ZINT Demo"
 wm minsize . 480 320