diff --git a/zuul/executor/client.py b/zuul/executor/client.py
index e5fa2764ff..3eebd2af97 100644
--- a/zuul/executor/client.py
+++ b/zuul/executor/client.py
@@ -197,12 +197,7 @@ class ExecutorClient(object):
         params['ZUUL_URL'] = item.current_build_set.zuul_url
         params['ZUUL_VOTING'] = job.voting and '1' or '0'
         if hasattr(item.change, 'number'):
-            changes_str = '^'.join(
-                ['%s:%s:%s' % (i.change.project.name, i.change.branch,
-                               i.change.ref)
-                 for i in all_items])
             params['ZUUL_BRANCH'] = item.change.branch
-            params['ZUUL_CHANGES'] = changes_str
 
         params['job'] = job.name
         params['timeout'] = job.timeout