diff --git a/tests/roles/bootstrap-host/tasks/prepare_aio_config.yml b/tests/roles/bootstrap-host/tasks/prepare_aio_config.yml
index d28b1594e1..78c17be58a 100644
--- a/tests/roles/bootstrap-host/tasks/prepare_aio_config.yml
+++ b/tests/roles/bootstrap-host/tasks/prepare_aio_config.yml
@@ -91,7 +91,7 @@
 
 - name: Set repo_build_pip_extra_indexes fact
   set_fact:
-    repo_build_pip_extra_indexes: "{{ fastest_wheel_mirror.stdout | list }}"
+    repo_build_pip_extra_indexes: "{{ fastest_wheel_mirror.stdout_lines }}"
   when: not pip_conf_file.stat.exists
 
 - name: Check whether the host has a git cache