diff --git a/.zuul.yaml b/.zuul.yaml
index 67a39c4..737eaf3 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -1,7 +1,11 @@
 - project:
     check:
       jobs:
-        - openstack-tox-lower-constraints
+        - openstack-tox-lower-constraints:
+            required-projects:
+              - openstack/horizon
     gate:
       jobs:
-        - openstack-tox-lower-constraints
+        - openstack-tox-lower-constraints:
+            required-projects:
+              - openstack/horizon