diff --git a/artiq/frontend/artiq_run.py b/artiq/frontend/artiq_run.py
index bc4f81ff5..263b3cf08 100755
--- a/artiq/frontend/artiq_run.py
+++ b/artiq/frontend/artiq_run.py
@@ -149,7 +149,7 @@ def get_argparser(with_file=True):
 def _build_experiment(device_mgr, dataset_mgr, args):
     arguments = parse_arguments(args.arguments)
     argument_mgr = ProcessArgumentManager(arguments)
-    managers = (device_mgr, dataset_mgr, argument_mgr)
+    managers = (device_mgr, dataset_mgr, argument_mgr, {})
     if hasattr(args, "file"):
         is_elf = args.file.endswith(".elf")
         is_ll  = args.file.endswith(".ll")
diff --git a/artiq/test/test_datasets.py b/artiq/test/test_datasets.py
index db35d7f34..4ea48cc6e 100644
--- a/artiq/test/test_datasets.py
+++ b/artiq/test/test_datasets.py
@@ -46,7 +46,7 @@ class ExperimentDatasetCase(unittest.TestCase):
         # connection would marshal updates between dataset_mgr and dataset_db.
         self.dataset_db = MockDatasetDB()
         self.dataset_mgr = DatasetManager(self.dataset_db)
-        self.exp = TestExperiment((None, self.dataset_mgr, None))
+        self.exp = TestExperiment((None, self.dataset_mgr, None, None))
 
     def test_set_local(self):
         with self.assertRaises(KeyError):