diff --git a/platformio/builder/tools/platformio.py b/platformio/builder/tools/platformio.py
index 1da60525..f6a2e4f1 100644
--- a/platformio/builder/tools/platformio.py
+++ b/platformio/builder/tools/platformio.py
@@ -197,7 +197,7 @@ def TouchSerialPort(env, port, baudrate):
         sleep(0.3)
 
 
-def WaitForNewSerialPort(env, before):
+def WaitForNewSerialPort(_, before):
     new_port = None
     elapsed = 0
     while elapsed < 10: