diff --git a/ohmpi/hardware_components/mux_2024_0_X.py b/ohmpi/hardware_components/mux_2024_0_X.py
index 7b5b71a3b90877440d9e095a5a7abc3d0fc647f8..923ea82989b04ac5a04344c0ab45869adae65987 100644
--- a/ohmpi/hardware_components/mux_2024_0_X.py
+++ b/ohmpi/hardware_components/mux_2024_0_X.py
@@ -89,7 +89,7 @@ class Mux(MuxAbstract):
             self._tca = adafruit_tca9548a.TCA9548A(self.connection, tca_address)[tca_channel]
 
         # Setup MCPs
-        self._mcp_jumper_pos = (kwargs.pop('addr2', None), kwargs.pop('addr1', None))
+        self._mcp_jumper_pos = {'addr2': kwargs.pop('addr2', None), 'addr1': kwargs.pop('addr1', None)}
         self._mcp_addresses = (kwargs.pop('mcp_0', None), kwargs.pop('mcp_1', None))
         if self._mcp_addresses[0] is None and self._mcp_addresses[1] is None:
             if self._mcp_jumper_pos['addr2'] is not None and self._mcp_jumper_pos['addr1'] is not None: