diff --git a/root/etc/profile.d/shell-timeout.sh b/root/etc/profile.d/shell-timeout.sh
index aa99b77..8e8688c 100644
--- a/root/etc/profile.d/shell-timeout.sh
+++ b/root/etc/profile.d/shell-timeout.sh
@@ -4,13 +4,20 @@
 # This will only be applied for non-graphical sessions,
 # or whenever root account is logged in
 
-TMOUT=600
-readonly TMOUT
+# If TMOUT was already set, unset it
+unset TMOUT
 
-[ -z "$DISPLAY" ] && export TMOUT;
+# Define the timeout delay (seconds)
+TIMEOUT=600
 
+# Set TMOUT when display is not set
+[ -z "$DISPLAY" ] && export TMOUT=$TIMEOUT;
+
+# Set TMOUT when in TTY
 case $(/usr/bin/tty) in
-	/dev/tty[0-9]*) export TMOUT;;
+	/dev/tty[0-9]*) export TMOUT=$TIMEOUT;;
 esac
 
-[ $UID -eq 0 ] && export TMOUT;
+# Set TMOUT when user is root
+[ $UID -eq 0 ] && export TMOUT=$TIMEOUT;
+