diff --git a/pio/espupload.py b/pio/espupload.py
old mode 100644
new mode 100755
diff --git a/pio/http-uploader.py b/pio/http-uploader.py
index dd563177f..88d5a23ce 100644
--- a/pio/http-uploader.py
+++ b/pio/http-uploader.py
@@ -1,4 +1,5 @@
 Import("env")
+import os
 
 # pio < 4.0.0
 # from base64 import b64decode
@@ -7,11 +8,6 @@ Import("env")
 # env.Replace(UPLOADCMD="$UPLOADER -u " + b64decode(ARGUMENTS.get("UPLOAD_PORT")) + " -f $SOURCES")
 
 # pio >= 4.0.0
-env.Replace(UPLOADER="pio\espupload.py")
+env.Replace(UPLOADER=os.path.join("pio", "espupload.py"))
 env.Replace(UPLOADERFLAGS="")
 env.Replace(UPLOADCMD="$UPLOADER -u $UPLOAD_PORT -f $SOURCES")
-
-'''
-env.Replace(UPLOADCMD="pio\espupload.py -f $SOURCES") # Windows
-env.Replace(UPLOADCMD="pio/espupload.py -f $SOURCES") # Linux
-'''
\ No newline at end of file