diff --git a/config_mb_2023_mux_2024.py b/config_mb_2023_mux_2024.py
index 252974c8890436af2ecd4286e67368d6ab5b7af6..cae61ec6924e814f18a9dfb98b380e8ed3f70c53 100644
--- a/config_mb_2023_mux_2024.py
+++ b/config_mb_2023_mux_2024.py
@@ -22,7 +22,7 @@ HARDWARE_CONFIG = {
                    },
     'tx' : {'model' : 'ohmpi_card_3_15',
              'mcp_board_address': 0x20,
-             'voltage_max': 12, # Maximum voltage [V]
+             'voltage_max': 12., # Maximum voltage [V]
              'current_max': 4800 / 50 / 2,  # Maximum current [mA]
              'r_shunt': 2  # Shunt resistance in Ohms
             },