diff --git a/master_unpack.py b/master_unpack.py
index 394a101..ea00f06 100644
--- a/master_unpack.py
+++ b/master_unpack.py
@@ -133,7 +133,7 @@ try:
     f = file(filename, "wb")
 
     shutil.copyfileobj(zf, f)
-    os.chmod(filename, 0644)
+    os.chmod(filename, 0o644)
 
     zf.close()
     z.close()