diff --git a/ohmpi/hardware_system.py b/ohmpi/hardware_system.py
index 78a122429df7693d4632e7b8b9aff27f3e66c426..23e21f474c21c831d6e65cb256246b759ec7375d 100644
--- a/ohmpi/hardware_system.py
+++ b/ohmpi/hardware_system.py
@@ -645,7 +645,7 @@ class OhmPiHardware:
             if self.tx.voltage != vab:
                 self.tx.voltage = vab
             if self.tx.current != 0.02:
-                self.tx.voltage = self.tx.pwr._voltage_max)
+                self.tx.voltage = self.tx.pwr._voltage_max
                 self.tx.current = 0.02
         else:
             vab = self.tx.voltage