diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index d396435..7ebfa1f 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -2,6 +2,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
+#include "pycore_abstract.h"   // _PyIndex_Check()
 #include "pycore_bytes_methods.h"
 #include "pycore_object.h"
 #include "pycore_pymem.h"
@@ -391,7 +392,7 @@
 static PyObject *
 bytearray_subscript(PyByteArrayObject *self, PyObject *index)
 {
-    if (PyIndex_Check(index)) {
+    if (_PyIndex_Check(index)) {
         Py_ssize_t i = PyNumber_AsSsize_t(index, PyExc_IndexError);
 
         if (i == -1 && PyErr_Occurred())
@@ -610,7 +611,7 @@
     char *buf, *bytes;
     buf = PyByteArray_AS_STRING(self);
 
-    if (PyIndex_Check(index)) {
+    if (_PyIndex_Check(index)) {
         Py_ssize_t i = PyNumber_AsSsize_t(index, PyExc_IndexError);
 
         if (i == -1 && PyErr_Occurred())
@@ -809,7 +810,7 @@
     }
 
     /* Is it an int? */
-    if (PyIndex_Check(arg)) {
+    if (_PyIndex_Check(arg)) {
         count = PyNumber_AsSsize_t(arg, PyExc_OverflowError);
         if (count == -1 && PyErr_Occurred()) {
             if (!PyErr_ExceptionMatches(PyExc_TypeError))