diff --git a/platformio/builder/tools/pioupload.py b/platformio/builder/tools/pioupload.py
index 9949bc41..dadb7cd7 100644
--- a/platformio/builder/tools/pioupload.py
+++ b/platformio/builder/tools/pioupload.py
@@ -56,7 +56,6 @@ def WaitForNewSerialPort(env, before):
     prev_port = env.subst("$UPLOAD_PORT")
     new_port = None
     elapsed = 0
-    sleep(1)
     while elapsed < 5 and new_port is None:
         now = util.get_serialports()
         for p in now: