diff --git a/tools/install_video_driver.sh b/tools/install_video_driver.sh
index cb7149e..dd81382 100644
--- a/tools/install_video_driver.sh
+++ b/tools/install_video_driver.sh
@@ -23,4 +23,4 @@ echo "#!/bin/sh
 
 # patch for display manager service which do not start automatically
 systemctl start display-manager.service &" >/etc/rc.d/rc.local
-chmod a+x /etc/rc.d/rc.local
+/usr/bin/chmod a+x /etc/rc.d/rc.local