diff --git a/Include/cpython/coreconfig.h b/Include/cpython/coreconfig.h
@@ -276,7 +276,19 @@ typedef struct {
    int legacy_windows_stdio;
#endif

-    /* --- Private fields -------- */

    /* Install importlib? If set to 0, importlib is not initialized at all.
       Needed by freeze_importlib. */