diff --git a/Objects/object.c b/Objects/object.c
index fd1fd256ba7..79f1c8a8356 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -451,6 +451,9 @@ PyObject_ASCII(PyObject *v)
     if (repr == NULL)
         return NULL;
 
+    if (PyUnicode_IS_ASCII(repr))
+        return repr;
+
     /* repr is guaranteed to be a PyUnicode object by PyObject_Repr */
     ascii = _PyUnicode_AsASCIIString(repr, "backslashreplace");
     Py_DECREF(repr);
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 99628cad726..0996afbbb8f 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -6499,7 +6499,7 @@ _PyUnicode_AsASCIIString(PyObject *unicode, const char *errors)
         return NULL;
     /* Fast path: if it is an ASCII-only string, construct bytes object
        directly. Else defer to above function to raise the exception. */
-    if (PyUnicode_MAX_CHAR_VALUE(unicode) < 128)
+    if (PyUnicode_IS_ASCII(unicode))
         return PyBytes_FromStringAndSize(PyUnicode_DATA(unicode),
                                          PyUnicode_GET_LENGTH(unicode));
     return unicode_encode_ucs1(unicode, errors, 128);