diff --git a/setup.py b/setup.py
index 904ce2a7a9a5c..370c49a754b95 100755
--- a/setup.py
+++ b/setup.py
@@ -473,8 +473,6 @@ def pxd(name):
                         define_macros=macros)
 extensions.append(packer_ext)
 extensions.append(unpacker_ext)
-# if not ISRELEASED:
-#     extensions.extend([sandbox_ext])
 
 if suffix == '.pyx' and 'setuptools' in sys.modules:
     # undo dumb setuptools bug clobbering .pyx sources back to .c