diff --git a/Include/code.h b/Include/code.h
index 1c8fbb36bd3..7dd13fe5dae 100644
--- a/Include/code.h
+++ b/Include/code.h
@@ -40,7 +40,10 @@ typedef struct {
 */
 #define CO_NOFREE       0x0040
 
-#define CO_GENERATOR_ALLOWED    0x1000 /* no longer used in an essential way */
+#if 0
+/* This is no longer used.  Stopped defining in 2.5, do not re-use. */
+#define CO_GENERATOR_ALLOWED    0x1000
+#endif
 #define CO_FUTURE_DIVISION    	0x2000
 
 #define CO_MAXBLOCKS 20 /* Max static block nesting within a function */
diff --git a/Include/pythonrun.h b/Include/pythonrun.h
index 5c78cce6051..446133a16ca 100644
--- a/Include/pythonrun.h
+++ b/Include/pythonrun.h
@@ -8,7 +8,7 @@ extern "C" {
 #endif
 
 #define PyCF_MASK (CO_FUTURE_DIVISION)
-#define PyCF_MASK_OBSOLETE (CO_GENERATOR_ALLOWED | CO_NESTED)
+#define PyCF_MASK_OBSOLETE (CO_NESTED)
 #define PyCF_SOURCE_IS_UTF8  0x0100
 #define PyCF_DONT_IMPLY_DEDENT 0x0200