diff --git a/post-debootstrap-installer.sh b/post-debootstrap-installer.sh
index 22f85e8..c174d53 100755
--- a/post-debootstrap-installer.sh
+++ b/post-debootstrap-installer.sh
@@ -24,6 +24,7 @@ apt-get -y install locales
 ### boot
 
 apt-get -y install mdadm cryptsetup systemd systemd-sysv btrfs-tools firmware-linux lvm2
+systemctl enable fstrim.timer
 
 # --force-confold because we already provide /etc/dropbear-initramfs/config
 apt-get -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" install dropbear-initramfs