diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index d4b2c93..070f795 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -12522,7 +12522,7 @@
 static PyObject *
 do_argstrip(PyObject *self, int striptype, PyObject *sep)
 {
-    if (sep != NULL && sep != Py_None) {
+    if (sep != Py_None) {
         if (PyUnicode_Check(sep))
             return _PyUnicode_XStrip(self, striptype, sep);
         else {
@@ -12559,7 +12559,7 @@
 /*[clinic input]
 str.lstrip as unicode_lstrip
 
-    chars: object = NULL
+    chars: object = None
     /
 
 Return a copy of the string with leading whitespace removed.
@@ -12569,7 +12569,7 @@
 
 static PyObject *
 unicode_lstrip_impl(PyObject *self, PyObject *chars)
-/*[clinic end generated code: output=3b43683251f79ca7 input=9e56f3c45f5ff4c3]*/
+/*[clinic end generated code: output=3b43683251f79ca7 input=529f9f3834448671]*/
 {
     return do_argstrip(self, LEFTSTRIP, chars);
 }
@@ -12578,7 +12578,7 @@
 /*[clinic input]
 str.rstrip as unicode_rstrip
 
-    chars: object = NULL
+    chars: object = None
     /
 
 Return a copy of the string with trailing whitespace removed.
@@ -12588,7 +12588,7 @@
 
 static PyObject *
 unicode_rstrip_impl(PyObject *self, PyObject *chars)
-/*[clinic end generated code: output=4a59230017cc3b7a input=ac89d0219cb411ee]*/
+/*[clinic end generated code: output=4a59230017cc3b7a input=62566c627916557f]*/
 {
     return do_argstrip(self, RIGHTSTRIP, chars);
 }