diff --git a/Tools/serial/rc.serial.jinja b/Tools/serial/rc.serial.jinja
index fb04e2ec27..753f2af750 100644
--- a/Tools/serial/rc.serial.jinja
+++ b/Tools/serial/rc.serial.jinja
@@ -3,7 +3,7 @@
 # serial autostart script generated with generate_serial_config.py
 
 
-set PRT_F /etc/init.d/rc.serial_port
+set PRT_F ${R}etc/init.d/rc.serial_port
 
 {% for command in commands -%}
 set PRT {{ command.port_param_name }}