diff --git a/arch-hardening.sh b/arch-hardening.sh
index a02f0a6..32dc7d6 100644
--- a/arch-hardening.sh
+++ b/arch-hardening.sh
@@ -132,9 +132,9 @@ EOL
 sudo sysctl --system
 
 # [SHLL-6220] Idle session handling
-sudo sed -i 's/^#\?TMOUT=.*/TMOUT=900/' /etc/profile
-sudo sed -i 's/^#\?readonly TMOUT.*/readonly TMOUT/' /etc/profile
-sudo sed -i 's/^#\?export TMOUT.*/export TMOUT/' /etc/profile
+echo 'TMOUT=900' | sudo tee -a /etc/profile > /dev/null
+echo 'readonly TMOUT' | sudo tee -a /etc/profile > /dev/null
+echo 'export TMOUT' | sudo tee -a /etc/profile > /dev/null
 
 # [MACF-6290] Enable MAC framework (AppArmor)
 sudo pacman -S --noconfirm --needed apparmor apparmor.d-git