diff --git a/qcodes_contrib_drivers/drivers/RohdeSchwarz/ZVL13.py b/qcodes_contrib_drivers/drivers/RohdeSchwarz/ZVL13.py
index c7ec8507f..be60f23ab 100644
--- a/qcodes_contrib_drivers/drivers/RohdeSchwarz/ZVL13.py
+++ b/qcodes_contrib_drivers/drivers/RohdeSchwarz/ZVL13.py
@@ -397,9 +397,6 @@ def _set_rf_power(self, val: int) -> None:
     def _get_format(self, tracename: str) -> str:
         return self.ask("CALC:FORM?")
 
-    def _strip(var: str) -> str:
-        return var.rstrip()[1:-1]
-
     def _form(self, msg:str) -> None:
         if msg == 'phase':                
             self.write('CALC:FORM PHAS')