diff --git a/frappy_psi/lakeshore.py b/frappy_psi/lakeshore.py
index 053d801..588ce39 100644
--- a/frappy_psi/lakeshore.py
+++ b/frappy_psi/lakeshore.py
@@ -166,7 +166,7 @@ class HeaterOutput(LakeShore, HasControlledBy, HasIO, Writable):
         self.set_heater_mode(3)
         self.set_range()
         percent = self.power_to_percent(target)
-        reply = self.set_par(f'MOUT {self.loop}', '%g' % percent)
+        reply = self.set_par(f'MOUT {self.loop}', percent)
         return self.percent_to_power(reply)
 
     def set_heater_mode(self, mode):