diff --git a/subiquity/cmd/schema.py b/subiquity/cmd/schema.py
index 29d8f98a..7dddd41d 100644
--- a/subiquity/cmd/schema.py
+++ b/subiquity/cmd/schema.py
@@ -54,6 +54,7 @@ def make_schema(app):
 def make_app():
     parser = make_server_args_parser()
     opts, unknown = parser.parse_known_args(["--dry-run"])
+    opts.kernel_cmdline = {}
     app = SubiquityServer(opts, "")
     # This is needed because the ubuntu-pro server controller accesses dr_cfg
     # in the initializer.
diff --git a/subiquitycore/tests/mocks.py b/subiquitycore/tests/mocks.py
index a936b15f..bc8da04e 100644
--- a/subiquitycore/tests/mocks.py
+++ b/subiquitycore/tests/mocks.py
@@ -45,6 +45,7 @@ def make_app(model=None):
     app.prev_screen = mock.Mock()
     app.hub = MessageHub()
     app.opts = mock.Mock()
+    app.opts.kernel_cmdline = {}
     app.opts.dry_run = True
     app.scale_factor = 1000
     app.echo_syslog_id = None