diff --git a/group_vars/dhcp.yml b/group_vars/dhcp.yml
index 0583a5a1adf8c13c8680c6ad5f03c9561b0b2490..b181eb94dc1e75d5c2cb790ca42bbc7841f7943a 100644
--- a/group_vars/dhcp.yml
+++ b/group_vars/dhcp.yml
@@ -8,7 +8,8 @@ glob_service_dhcp:
   name: dhcp
   install_dir: /var/local/services/dhcp
   generated: yes
-  frequency: "*/2 * * * *"
-  options: -q
+  cron:
+    frequency: "*/2 * * * *"
+    options: -q
   dependencies:
     - python3-jinja2
diff --git a/group_vars/firewall.yml b/group_vars/firewall.yml
index e0d691290bb16a6bfa77ffb56df48036f38911a1..5f5a97224965f584353d0e2a021570ec4f505ef1 100644
--- a/group_vars/firewall.yml
+++ b/group_vars/firewall.yml
@@ -1,8 +1,9 @@
 glob_service_firewall:
   name: firewall
   install_dir: /var/local/services/firewall
-  frequency: "*/2 * * * *"
-  options: -q
+  cron:
+    frequency: "*/2 * * * *"
+    options: -q
   dependencies:
     - python3-iso8601
     - python3-jinja2
diff --git a/host_vars/routeur-gulp.cachan-adm.crans.org/prefix_delegation.yml b/host_vars/routeur-gulp.cachan-adm.crans.org/prefix_delegation.yml
index 6397cbad094a3ad9e3f2d5ffaf455b605f179c85..1cb904efd0e3e69603f93a0a9d34200b196385fb 100644
--- a/host_vars/routeur-gulp.cachan-adm.crans.org/prefix_delegation.yml
+++ b/host_vars/routeur-gulp.cachan-adm.crans.org/prefix_delegation.yml
@@ -6,8 +6,9 @@ loc_service_prefix_delegation:
     user: services
     password: "{{ vault.re2o_service_password }}"
   name: prefix_delegation
-  install_dir: /var/local/services/prefix_delegation
-  frequency: "*/5 * * * *"
+  cron:
+    install_dir: /var/local/services/prefix_delegation
+    frequency: "*/5 * * * *"
   dependencies:
     - python3-iso8601
   git:
diff --git a/roles/service/tasks/main.yml b/roles/service/tasks/main.yml
index ec31e7de7e6004df105b4e92fa0ca51c1f6128de..78c40fa81799c10630704089468f515a57930b23 100644
--- a/roles/service/tasks/main.yml
+++ b/roles/service/tasks/main.yml
@@ -7,6 +7,7 @@
   register: apt_result
   retries: 3
   until: apt_result is succeeded
+  when: service.dependencies is defined
 
 - name: Create service directory
   file:
@@ -54,6 +55,7 @@
   template:
     src: cron.d/service.j2
     dest: "/etc/cron.d/services-{{ service.name }}"
+  when: service.cron is defined
 
 - name: Deploy service configuration
   template:
diff --git a/roles/service/templates/cron.d/service.j2 b/roles/service/templates/cron.d/service.j2
index 76847b5f699c20993f50f00abcc2a872622b3c25..0bbc719ee7e11f722b2e4d60817d9e2cfc68c773 100644
--- a/roles/service/templates/cron.d/service.j2
+++ b/roles/service/templates/cron.d/service.j2
@@ -1,2 +1,2 @@
 {{ ansible_header | comment }}
-{{ service.frequency }} root /usr/bin/python3 {{ service.install_dir }}/{{ service.name }}.py {{ service.options | default("") }}
+{{ service.cron.frequency }} root /usr/bin/python3 {{ service.install_dir }}/{{ service.name }}.py {{ service.cron.options | default("") }}