diff --git a/tasks/user_accounts.yml b/tasks/user_accounts.yml
index 415581d3..01a62a19 100644
--- a/tasks/user_accounts.yml
+++ b/tasks/user_accounts.yml
@@ -32,4 +32,4 @@
 - name: change system accounts not on the user provided ignore-list
   user: name='{{item}}' shell='{{os_nologin_shell_path}}' password='*'
   with_items:
-    - '{{sys_accs_cond | default(omit) | difference(os_ignore_users) }}'
+    - '{{sys_accs_cond | default(omit) | difference(os_ignore_users) | list }}'