diff --git a/tasks/cert.yml b/tasks/cert.yml
index fbec9c6f9b4acc0e7f3b7c96facc31827844219e..966a69918fc86cb63e69b057123bb972f6bdda4d 100644
--- a/tasks/cert.yml
+++ b/tasks/cert.yml
@@ -14,7 +14,7 @@
       dest: /etc/letsencrypt/{{ cert.domain }}.ini
       owner: root
       group: root
-      mode: 644
+      mode: 0644
     register: cert_definition
 
   - include_tasks: cert_generate.yml
diff --git a/tasks/install.yml b/tasks/install.yml
index 3095e3c88b134ca9dfea490c9f3ec48246013b2a..5daea03ad75923c3537dfbc2ecadd164dc80f104 100644
--- a/tasks/install.yml
+++ b/tasks/install.yml
@@ -10,7 +10,7 @@
   apt_repository:
     repo: ppa:certbot/certbot
     state: present
-    mode: 644
+    mode: 0644
 
 - name: Install CertBot
   apt: