diff --git a/debian/post.install.ovh.sh b/debian/post.install.ovh.sh
index 15f6e2b..2841a26 100755
--- a/debian/post.install.ovh.sh
+++ b/debian/post.install.ovh.sh
@@ -37,8 +37,8 @@ apt --assume-yes install -- wget
 # Remove last partition with all free space
 umount /mnt/free
 lvremove --force /dev/mapper/vg-free
-/bin/rmdir --force -- /mnt/free
-/bin/sed --in-place -- ';/mnt/free;d' /etc/fstab
+/bin/rmdir -- /mnt/free
+/bin/sed --in-place -- '/\/mnt\/free/d' /etc/fstab
 
 # Allow root connection with password
 /bin/sed --in-place -- 's/\(^\|^\#\)\(PermitRootLogin\).*/\2 yes/g' /etc/ssh/sshd_config