diff --git a/Objects/intobject.c b/Objects/intobject.c
index eacad9d..2af9451 100644
--- a/Objects/intobject.c
+++ b/Objects/intobject.c
@@ -368,7 +368,7 @@
 	if (*end != '\0') {
   bad:
 		slen = strlen(s) < 200 ? strlen(s) : 200;
-		sobj = PyString_FromStringAndSize(s, slen);
+		sobj = PyBytes_FromStringAndSize(s, slen);
 		if (sobj == NULL)
 			return NULL;
 		srepr = PyObject_Repr(sobj);
@@ -377,7 +377,7 @@
 			return NULL;
 		PyErr_Format(PyExc_ValueError,
 			     "invalid literal for int() with base %d: %s",
-			     base, PyString_AS_STRING(srepr));
+			     base, PyBytes_AS_STRING(srepr));
 		Py_DECREF(srepr);
 		return NULL;
 	}
@@ -965,11 +965,11 @@
 		return PyInt_FromLong(0L);
 	if (base == -909)
 		return PyNumber_Int(x);
-	if (PyString_Check(x)) {
+	if (PyBytes_Check(x)) {
 		/* Since PyInt_FromString doesn't have a length parameter,
 		 * check here for possible NULs in the string. */
-		char *string = PyString_AS_STRING(x);
-		if (strlen(string) != PyString_Size(x)) {
+		char *string = PyBytes_AS_STRING(x);
+		if (strlen(string) != PyBytes_Size(x)) {
 			/* create a repr() of the input string,
 			 * just like PyInt_FromString does */
 			PyObject *srepr;
@@ -978,7 +978,7 @@
 				return NULL;
 			PyErr_Format(PyExc_ValueError,
 			     "invalid literal for int() with base %d: %s",
-			     base, PyString_AS_STRING(srepr));
+			     base, PyBytes_AS_STRING(srepr));
 			Py_DECREF(srepr);
 			return NULL;
 		}
@@ -1106,7 +1106,7 @@
 	if (negative)
 		*--p = '-';
 
-	return PyString_FromStringAndSize(p, &buf[sizeof(buf)] - p);
+	return PyBytes_FromStringAndSize(p, &buf[sizeof(buf)] - p);
 }
 
 static PyObject *
@@ -1116,7 +1116,7 @@
 
 	if (!PyArg_ParseTuple(args, "O:__format__", &format_spec))
 		return NULL;
-	if (PyString_Check(format_spec))
+	if (PyBytes_Check(format_spec))
 		return string_int__format__(self, args);
 	if (PyUnicode_Check(format_spec)) {
 		/* Convert format_spec to a str */