diff --git a/Include/unicodeobject.h b/Include/unicodeobject.h
index 4d2a8e4..6c492d1 100644
--- a/Include/unicodeobject.h
+++ b/Include/unicodeobject.h
@@ -668,8 +668,7 @@
 
 #ifndef Py_LIMITED_API
 PyAPI_FUNC(PyObject *) _PyUnicode_AsDefaultEncodedString(
-    PyObject *unicode,
-    const char *errors);
+    PyObject *unicode);
 #endif
 
 /* Returns a pointer to the default encoding (UTF-8) of the