diff --git a/test-playbooks/tox-siblings.yaml b/test-playbooks/tox-siblings.yaml
index 3cf5e0686..02a5acff7 100644
--- a/test-playbooks/tox-siblings.yaml
+++ b/test-playbooks/tox-siblings.yaml
@@ -9,3 +9,6 @@
       vars:
         tox_envlist: docs
         tox_constraints_file: '{{ zuul.project.src_dir }}/zuul-tests.d/test-constraints.txt'
+        tox_environment:
+          ANSIBLE_ROLES_PATH: "{{ ansible_user_dir }}/{{ zuul.project.src_dir }}/roles"
+          ANSIBLE_LIBRARY: "{{ ansible_user_dir }}/{{ zuul.project.src_dir }}/tests/fake-ansible"
diff --git a/zuul-tests.d/python-jobs.yaml b/zuul-tests.d/python-jobs.yaml
index 9c6117485..961227c3d 100644
--- a/zuul-tests.d/python-jobs.yaml
+++ b/zuul-tests.d/python-jobs.yaml
@@ -404,6 +404,8 @@
     description: Test the tox role's sibling functionality
     files:
       - roles/tox/.*
+      - tox.ini
+      - test-playbooks/tox-siblings.yaml
     run: test-playbooks/tox-siblings.yaml
     required-projects:
       - zuul/zuul