diff --git a/setup.py b/setup.py
index b380415d444..4f56b5114a3 100644
--- a/setup.py
+++ b/setup.py
@@ -271,8 +271,6 @@ class PyBuildExt(build_ext):
         exts.append( Extension('_weakref', ['_weakref.c']) )
         exts.append( Extension('xreadlines', ['xreadlinesmodule.c']) )
 
-        exts.append( Extension("bits", ["bits.c"]) )
-
         # array objects
         exts.append( Extension('array', ['arraymodule.c']) )
         # complex math library functions