diff --git a/Python/ast.c b/Python/ast.c
index e6f7167..05147a4 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -4766,7 +4766,7 @@
                           size_t len)
 {
     const char *first_invalid_escape;
-    PyObject *result = _PyBytes_DecodeEscape(s, len, NULL, 0, NULL,
+    PyObject *result = _PyBytes_DecodeEscape(s, len, NULL,
                                              &first_invalid_escape);
     if (result == NULL)
         return NULL;