diff --git a/dev/test_4_mux_2024.py b/dev/test_4_mux_2024.py
index 6eba36a7958112c7fdbad8d58fb0248550049249..921a5aec12695a3d8592513876b8488ff766dc1a 100644
--- a/dev/test_4_mux_2024.py
+++ b/dev/test_4_mux_2024.py
@@ -17,7 +17,7 @@ if stand_alone_mux:
     mux_id = 'mux_02'
     print(MUX_CONFIG)
     MUX_CONFIG.update(HARDWARE_CONFIG['mux']['boards'][mux_id])
-    MUX_CONFIG.update('id', mux_id)
+    MUX_CONFIG.update({'id': mux_id})
     MUX_CONFIG['ctl'] = ctl_module.Ctl()
     mux = Mux(**MUX_CONFIG)
     mux.switch_one(elec=1, role='M', state='on')