diff --git a/roles/docker/tasks/addusers.yml b/roles/docker/tasks/addusers.yml
index de97165..29058bc 100644
--- a/roles/docker/tasks/addusers.yml
+++ b/roles/docker/tasks/addusers.yml
@@ -12,6 +12,6 @@
   user:
     name: "{{ item }}"
     groups: docker
-    append: yes
+    append: true
   with_items: "{{ docker_users }}"
   when: docker_users is defined