diff --git a/Include/object.h b/Include/object.h
index 68ca7b4..7584d4c 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -496,8 +496,8 @@
 PyAPI_FUNC(void) PyType_Modified(PyTypeObject *);
 
 #ifndef Py_LIMITED_API
-PyAPI_FUNC(PyObject *) _PyType_GetDocFromInternalDoc(const char *);
-PyAPI_FUNC(PyObject *) _PyType_GetTextSignatureFromInternalDoc(const char *);
+PyAPI_FUNC(PyObject *) _PyType_GetDocFromInternalDoc(const char *, const char *);
+PyAPI_FUNC(PyObject *) _PyType_GetTextSignatureFromInternalDoc(const char *, const char *);
 #endif
 
 /* Generic operations on objects */