diff --git a/Include/code.h b/Include/code.h
index 145a9a1..efaf3c4 100644
--- a/Include/code.h
+++ b/Include/code.h
@@ -42,15 +42,15 @@
 */
 #define CO_NOFREE       0x0040
 
-#if 0
 /* These are no longer used. */
+#if 0
 #define CO_GENERATOR_ALLOWED    0x1000
+#endif
 #define CO_FUTURE_DIVISION    	0x2000
 #define CO_FUTURE_ABSOLUTE_IMPORT 0x4000 /* do absolute imports by default */
 #define CO_FUTURE_WITH_STATEMENT  0x8000
 #define CO_FUTURE_PRINT_FUNCTION  0x10000
 #define CO_FUTURE_UNICODE_LITERALS 0x20000
-#endif
 
 #define CO_FUTURE_BARRY_AS_BDFL  0x40000
 
diff --git a/Include/pythonrun.h b/Include/pythonrun.h
index 86d9fe2..09d3ee5 100644
--- a/Include/pythonrun.h
+++ b/Include/pythonrun.h
@@ -7,8 +7,10 @@
 extern "C" {
 #endif
 
-#define PyCF_MASK CO_FUTURE_BARRY_AS_BDFL
-#define PyCF_MASK_OBSOLETE 0
+#define PyCF_MASK (CO_FUTURE_DIVISION | CO_FUTURE_ABSOLUTE_IMPORT | \
+                   CO_FUTURE_WITH_STATEMENT | CO_FUTURE_PRINT_FUNCTION | \
+                   CO_FUTURE_UNICODE_LITERALS | CO_FUTURE_BARRY_AS_BDFL)
+#define PyCF_MASK_OBSOLETE (CO_NESTED)
 #define PyCF_SOURCE_IS_UTF8  0x0100
 #define PyCF_DONT_IMPLY_DEDENT 0x0200
 #define PyCF_ONLY_AST 0x0400
diff --git a/Lib/test/test___future__.py b/Lib/test/test___future__.py
index 77006e1..9d98746 100644
--- a/Lib/test/test___future__.py
+++ b/Lib/test/test___future__.py
@@ -53,9 +53,12 @@
 
             a(hasattr(value, "compiler_flag"),
                    "feature is missing a .compiler_flag attr")
+            # Make sure the compile accepts the flag.
+            compile("", "<test>", "exec", value.compiler_flag)
             a(isinstance(getattr(value, "compiler_flag"), int),
                    ".compiler_flag isn't int")
 
+
 def test_main():
     support.run_unittest(FutureTest)
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 125a5f0..b08ba8f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -20,6 +20,11 @@
   the 'surrogateescape' error handler, a string which contains unpaired
   surrogates.
 
+C-API
+-----
+
+- The code flags for old __future__ features are now available again.
+
 Library
 -------