diff --git a/platformio/builder/tools/pioupload.py b/platformio/builder/tools/pioupload.py
index 4eb990d6..d4cc03f8 100644
--- a/platformio/builder/tools/pioupload.py
+++ b/platformio/builder/tools/pioupload.py
@@ -18,9 +18,10 @@ from os.path import isfile, join
 from shutil import copyfile
 from time import sleep
 
-from platformio.util import get_logicaldisks, get_serialports, get_systype
 from serial import Serial
 
+from platformio.util import get_logicaldisks, get_serialports, get_systype
+
 
 def FlushSerialBuffer(env, port):
     s = Serial(env.subst(port))