diff --git a/ohmpi/hardware_system.py b/ohmpi/hardware_system.py
index a365d36d32a9f58f79f7a088c5c710ab9edbd152..f7c52784e65d4e59a40f28043189ef2be4d5c80f 100644
--- a/ohmpi/hardware_system.py
+++ b/ohmpi/hardware_system.py
@@ -92,7 +92,7 @@ class OhmPiHardware:
         self.tx.pwr = self.pwr
         self._cabling = kwargs.pop('cabling', {})
         self.mux_boards = {}
-        for mux_id, mux_config in HARDWARE_CONFIG['mux'].items():
+        for mux_id, mux_config in HARDWARE_CONFIG['mux']['boards'].items():
             print(f'mux_id: {mux_id}, mux_config: {mux_config}')  # TODO: Delete me!
             mux_config.pop('model', '')
             constructor = mux_config.pop('constructor')