diff --git a/roles/mail_server/molecule/default/prepare.yml b/roles/mail_server/molecule/default/prepare.yml
index a1c5ead800cb195659dac0677f037d61a1ae47a0..d17af227f5c44ae7dd3c4e8d6f5d6b45b0191156 100644
--- a/roles/mail_server/molecule/default/prepare.yml
+++ b/roles/mail_server/molecule/default/prepare.yml
@@ -83,7 +83,7 @@
         state: directory
         owner: vagrant
         group: vagrant
-        mode: 0755
+        mode: "0755"
 
     - name: Create virtual environment for running ClamAV database sync tool
       become: true
@@ -98,7 +98,7 @@
         dest: /var/lib/cvdupdate/requirements.txt
         owner: vagrant
         group: vagrant
-        mode: 0644
+        mode: "0644"
 
     - name: Install requirements in the pipreqcheck virtual environment
       become: true
@@ -110,7 +110,7 @@
     - name: Allow traversal of Vagrant directory by the http server user
       file:
         path: /vagrant/
-        mode: 0711
+        mode: "0711"
 
     - name: Create directory for storing ClamAV database files
       file:
@@ -118,7 +118,7 @@
         state: directory
         owner: vagrant
         group: vagrant
-        mode: 0755
+        mode: "0755"
 
     - name: Configure default location for storing ClamAV database files  # noqa no-changed-when
       # [no-changed-when] Commands should not change things if nothing needs doing
@@ -144,7 +144,7 @@
       copy:
         dest: "/etc/ssl/private/nginx_https.key"
         content: "{{ clamav_database_http_server_tls_key }}"
-        mode: 0640
+        mode: "0640"
         owner: root
         group: root
       notify:
@@ -154,7 +154,7 @@
       copy:
         dest: "/etc/ssl/certs/nginx_https.pem"
         content: "{{ clamav_database_http_server_tls_certificate }}"
-        mode: 0644
+        mode: "0644"
         owner: root
         group: root
       notify:
@@ -166,7 +166,7 @@
         dest: /etc/nginx/sites-available/default
         owner: root
         group: root
-        mode: 0644
+        mode: "0644"
       notify:
         - Restart nginx
 
@@ -197,7 +197,7 @@
           CipherString = DEFAULT@SECLEVEL=0
         owner: root
         group: root
-        mode: 0644
+        mode: "0644"
         state: present
 
     - name: Set-up the hosts file
@@ -207,7 +207,7 @@
         line: "{{ item.key }} {{ item.value }}"
         owner: root
         group: root
-        mode: 0644
+        mode: "0644"
         state: present
       with_dict:
         # Force mail servers to use local ClamAV database mirror.
@@ -285,7 +285,7 @@
         dest: "/home/vagrant/{{ item }}"
         owner: vagrant
         group: vagrant
-        mode: 0600
+        mode: "0600"
       with_items:
         - imapcli-parameters-mandatory-john_doe.conf
         - imapcli-parameters-mandatory-jane_doe.conf
@@ -298,7 +298,7 @@
         dest: /usr/local/share/ca-certificates/testca.crt
         owner: root
         group: root
-        mode: 0644
+        mode: "0644"
       notify:
         - Update CA certificate cache
 
@@ -322,7 +322,7 @@
             dest: "/etc/postfix/main.cf"
             owner: root
             group: root
-            mode: 0644
+            mode: "0644"
           notify:
             - Restart Postfix