diff --git a/platformio/__init__.py b/platformio/__init__.py
index 4d895b31..cd24c147 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -1,7 +1,7 @@
 # Copyright (C) Ivan Kravets <me@ikravets.com>
 # See LICENSE for details.
 
-VERSION = (1, 1, 0)
+VERSION = (1, 2, "0.dev0")
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"
diff --git a/platformio/builder/tools/pioar.py b/platformio/builder/tools/pioar.py
index e3b2fed4..c98fa6c0 100644
--- a/platformio/builder/tools/pioar.py
+++ b/platformio/builder/tools/pioar.py
@@ -1,29 +1,21 @@
 # Copyright (C) Ivan Kravets <me@ikravets.com>
 # See LICENSE for details.
 
-import atexit
-from os import remove
-from tempfile import mkstemp
+from hashlib import md5
+from os.path import join
+from tempfile import gettempdir
 
 MAX_SOURCES_LENGTH = 8000  # Windows CLI has limit with command length to 8192
 
 
-def _remove_tmpfile(path):
-    try:
-        remove(path)
-    except WindowsError:  # pylint: disable=E0602
-        pass
-
-
 def _huge_sources_hook(sources):
-    if len(str(sources)) < MAX_SOURCES_LENGTH:
+    _sources = str(sources).replace("\\", "/")
+    if len(str(_sources)) < MAX_SOURCES_LENGTH:
         return sources
 
-    _, tmp_file = mkstemp()
+    tmp_file = join(gettempdir(), "pioarargs-%s" % md5(_sources).hexdigest())
     with open(tmp_file, "w") as f:
-        f.write(str(sources).replace("\\", "/"))
-
-    atexit.register(_remove_tmpfile, tmp_file)
+        f.write(_sources)
 
     return "@%s" % tmp_file