diff --git a/PC/config.c b/PC/config.c
index 6209d7e284f3fd..0c08bfeaa0dc5d 100644
--- a/PC/config.c
+++ b/PC/config.c
@@ -31,7 +31,9 @@ extern PyObject* PyInit__locale(void);
#endif
extern PyObject* PyInit__codecs(void);
extern PyObject* PyInit__weakref(void);
+/* XXX: These two should really be extracted to standalone extensions. */
extern PyObject* PyInit_xxsubtype(void);
+extern PyObject* PyInit__xxsubinterpreters(void);
extern PyObject* PyInit_zipimport(void);
extern PyObject* PyInit__random(void);
extern PyObject* PyInit_itertools(void);
@@ -126,6 +128,7 @@ struct _inittab _PyImport_Inittab[] = {
{"_json", PyInit__json},
{"xxsubtype", PyInit_xxsubtype},
+ {"_xxsubinterpreters", PyInit__xxsubinterpreters},
{"zipimport", PyInit_zipimport},
#ifdef _Py_HAVE_ZLIB
{"zlib", PyInit_zlib},
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
index f30945508698af..bf4131e91b0a15 100644
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -279,6 +279,7 @@
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