diff --git a/etc/taskcluster/mock.py b/etc/taskcluster/mock.py
index 107a8380f1a..14b52720db7 100755
--- a/etc/taskcluster/mock.py
+++ b/etc/taskcluster/mock.py
@@ -38,6 +38,7 @@ class Index:
 stringDate = str
 slugId = b"<new id>".lower
 sys.exit = Queue = fromNow = MagicMock()
+sys.modules["taskcluster"] = sys.modules[__name__]
 sys.dont_write_bytecode = True
 os.environ.update(**{k: k for k in "TASK_ID TASK_OWNER TASK_SOURCE GIT_URL GIT_SHA".split()})
 os.environ["GIT_REF"] = "refs/heads/auto"