--- a/taskcluster/taskgraph/actions/registry.py
+++ b/taskcluster/taskgraph/actions/registry.py
@@ -216,17 +216,17 @@ def register_callback_action(name, title
                         parameters['project'], parameters['head_rev'], parameters['pushlog_id']),
                 ],
                 'payload': {
                     'env': {
                         'GECKO_BASE_REPOSITORY': 'https://hg.mozilla.org/mozilla-unified',
                         'GECKO_HEAD_REPOSITORY': parameters['head_repository'],
                         'GECKO_HEAD_REF': parameters['head_ref'],
                         'GECKO_HEAD_REV': parameters['head_rev'],
-                        'HG_STORE_PATH': '/home/builds/checkouts/hg-store',
+                        'HG_STORE_PATH': '/builds/worker/checkouts/hg-store',
                         'ACTION_TASK_GROUP_ID': task_group_id,
                         'ACTION_TASK_ID': {'$json': {'$eval': 'taskId'}},
                         'ACTION_TASK': {'$json': {'$eval': 'task'}},
                         'ACTION_INPUT': {'$json': {'$eval': 'input'}},
                         'ACTION_CALLBACK': cb.__name__,
                         'ACTION_PARAMETERS': {'$json': {'$eval': 'parameters'}},
                     },
                     'cache': {