diff --git a/tasks/docker-users.yml b/tasks/docker-users.yml
index ccc1ac7..afebd9a 100644
--- a/tasks/docker-users.yml
+++ b/tasks/docker-users.yml
@@ -2,6 +2,6 @@
 - name: Ensure docker users are added to the docker group.
   user:
     name: "{{ item }}"
-    group: docker
+    groups: docker
     append: yes
   with_items: "{{ docker_users }}"