diff --git a/measurement_main.py b/measurement_main.py
index a46692c..dd611e8 100644
--- a/measurement_main.py
+++ b/measurement_main.py
@@ -246,12 +246,12 @@ def monitor_serial(ser, output_file):
         return
 
 
-def start_serial_monitoring(serial, baudrate, folder, prefix):
+def start_serial_monitoring(ser, baudrate, folder, prefix):
     global modem_serial_obj
 
-    print_message("Opening serial port for {}".format(serial))
+    print_message("Opening serial port for {}".format(ser))
     modem_serial_obj = serial.Serial(
-        port=serial,
+        port=ser,
         baudrate=baudrate,
     )
     modem_serial_obj.isOpen()