diff --git a/support/buildbot/bootstrap.py b/support/buildbot/bootstrap.py
index a2944b3..c5b6d83 100644
--- a/support/buildbot/bootstrap.py
+++ b/support/buildbot/bootstrap.py
@@ -60,7 +60,7 @@ def main():
     with open(os.path.join('support', 'buildbot', 'buildconfig.json'), 'rt') as fp:
         config_root = json.load(fp)
 
-    config = config_root[args.config]
+    config = config_root.get(args.config, {})
 
     # Set build properties.
     build_env = os.environ.copy()