diff --git a/roles/backup_client/molecule/default/prepare.yml b/roles/backup_client/molecule/default/prepare.yml
index b9c64c0164bc2770650c363c7a852a97b48f6b1d..8bd2d5b25faf4c7e24752fd7809ceff043252cb5 100644
--- a/roles/backup_client/molecule/default/prepare.yml
+++ b/roles/backup_client/molecule/default/prepare.yml
@@ -26,7 +26,7 @@
         dest: "{{ item.value }}"
         owner: root
         group: root
-        mode: 0600
+        mode: "0600"
       with_dict:
         tests/data/ssh/server_rsa: /etc/ssh/ssh_host_rsa_key
         tests/data/ssh/server_ed25519: /etc/ssh/ssh_host_ed25519_key
@@ -56,7 +56,7 @@
         dest: "/etc/ssh/sshd_config.d/chroot_backup_users.conf"
         owner: root
         group: root
-        mode: 0600
+        mode: "0600"
       notify:
         - Restart ssh
 
@@ -96,7 +96,7 @@
         state: directory
         owner: root
         group: root
-        mode: 0755
+        mode: "0755"
       with_items: "{{ backup_users }}"
 
     - name: Set-up duplicity backup directories
@@ -105,7 +105,7 @@
         state: directory
         owner: root
         group: backup-users
-        mode: 0770
+        mode: "0770"
       with_items: "{{ backup_users }}"
 
   handlers: