diff --git a/Lib/os.py b/Lib/os.py
index a8a08ed..a4d07c9 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -42,9 +42,7 @@
     curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';'
     defpath = '.;C:\\bin'
     from nt import *
-    for i in ['_exit',
-              '_P_WAIT', '_P_NOWAIT', '_P_OVERLAY',
-              '_P_NOWAITO', '_P_DETACH']:
+    for i in ['_exit']:
         try:
             exec "from nt import " + i
         except ImportError: