diff --git a/ohmpi/hardware_components/mux_2024_0_X.py b/ohmpi/hardware_components/mux_2024_0_X.py
index 7e3690dfcd37e3998eea0515dee729ccbe7245d2..fe50d4f2bd1c2cd7b1d765f40188574c6e917db2 100644
--- a/ohmpi/hardware_components/mux_2024_0_X.py
+++ b/ohmpi/hardware_components/mux_2024_0_X.py
@@ -142,6 +142,6 @@ class Mux(MuxAbstract):
 
     def _mcp_jumper_pos_to_addr(self):
         d = {'up': 0, 'down': 1}
-        mcp_0 = hex(int(f'0100{d[self._mcp_jumper_pos['addr2']]}{d[self._mcp_jumper_pos['addr1']]}0', 2))
-        mcp_1 = hex(int(f'0100{d[self._mcp_jumper_pos['addr2']]}{d[self._mcp_jumper_pos['addr1']]}1', 2))
+        mcp_0 = hex(int(f"0100{d[self._mcp_jumper_pos['addr2']]}{d[self._mcp_jumper_pos['addr1']]}0", 2))
+        mcp_1 = hex(int(f"0100{d[self._mcp_jumper_pos['addr2']]}{d[self._mcp_jumper_pos['addr1']]}1", 2))
         self._mcp_addresses = {'mcp_0': mcp_0, 'mcp_1': mcp_1}
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