diff --git a/platformio/builder/scripts/atmelavr.py b/platformio/builder/scripts/atmelavr.py
index 7b6cc462..9235d239 100644
--- a/platformio/builder/scripts/atmelavr.py
+++ b/platformio/builder/scripts/atmelavr.py
@@ -111,7 +111,7 @@ env.Append(
 )
 
 
-def before_upload(target, source, env):  # pylint: disable=W0613
+def before_upload(target, source, env):  # pylint: disable=W0613,W0621
 
     def _autodetect_upload_port():
         if "UPLOAD_PORT" not in env: