diff -r af793c7580f1 Lib/dis.py
--- a/Lib/dis.py	Wed Jun 17 10:09:24 2015 -0500
+++ b/Lib/dis.py	Sat Jun 20 16:33:24 2015 -0400
@@ -5,6 +5,7 @@
 import collections
 import io
 
+import _opcode
 from opcode import *
 from opcode import __all__ as _opcodes_all
 
@@ -76,17 +77,10 @@
 # The inspect module interrogates this dictionary to build its
 # list of CO_* constants. It is also used by pretty_flags to
 # turn the co_flags field into a human readable list.
-COMPILER_FLAG_NAMES = {
-     1: "OPTIMIZED",
-     2: "NEWLOCALS",
-     4: "VARARGS",
-     8: "VARKEYWORDS",
-    16: "NESTED",
-    32: "GENERATOR",
-    64: "NOFREE",
-   128: "COROUTINE",
-   256: "ITERABLE_COROUTINE",
-}
+COMPILER_FLAG_NAMES = {}
+for _name in dir(_opcode):
+    if _name.startswith('CO_'):
+        COMPILER_FLAG_NAMES[getattr(_opcode, _name)] = _name[3:]
 
 def pretty_flags(flags):
     """Return pretty representation of code flags."""
diff -r af793c7580f1 Lib/inspect.py
--- a/Lib/inspect.py	Wed Jun 17 10:09:24 2015 -0500
+++ b/Lib/inspect.py	Sat Jun 20 16:33:24 2015 -0400
@@ -50,11 +50,13 @@
 from operator import attrgetter
 from collections import namedtuple, OrderedDict
 
+import _opcode
+
 # Create constants for the compiler flags in Include/code.h
-# We try to get them from dis to avoid duplication
 mod_dict = globals()
-for k, v in dis.COMPILER_FLAG_NAMES.items():
-    mod_dict["CO_" + v] = k
+for _name in dir(_opcode):
+    if _name.startswith('CO_'):
+        mod_dict[_name] = getattr(_opcode, _name)
 
 # See Include/object.h
 TPFLAGS_IS_ABSTRACT = 1 << 20
diff -r af793c7580f1 Modules/_opcode.c
--- a/Modules/_opcode.c	Wed Jun 17 10:09:24 2015 -0500
+++ b/Modules/_opcode.c	Sat Jun 20 16:33:24 2015 -0400
@@ -74,5 +74,22 @@
 PyMODINIT_FUNC
 PyInit__opcode(void)
 {
-    return PyModule_Create(&opcodemodule);
+    PyObject *m;
+
+    m = PyModule_Create(&opcodemodule);
+    if (m == NULL)
+        return NULL;
+
+    if (PyModule_AddIntMacro(m, CO_OPTIMIZED) == -1 ||
+        PyModule_AddIntMacro(m, CO_NEWLOCALS) == -1 ||
+        PyModule_AddIntMacro(m, CO_VARARGS) == -1 ||
+        PyModule_AddIntMacro(m, CO_VARKEYWORDS) == -1 ||
+        PyModule_AddIntMacro(m, CO_NESTED) == -1 ||
+        PyModule_AddIntMacro(m, CO_GENERATOR) == -1 ||
+        PyModule_AddIntMacro(m, CO_NOFREE) == -1 ||
+        PyModule_AddIntMacro(m, CO_COROUTINE) == -1 ||
+        PyModule_AddIntMacro(m, CO_ITERABLE_COROUTINE) == -1)
+        return NULL;
+
+    return m;
 }