diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index 20b7f51..8c08866 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -1042,7 +1042,7 @@
 /*[clinic input]
 float.__round__
 
-    ndigits as o_ndigits: object = NULL
+    ndigits as o_ndigits: object = None
     /
 
 Return the Integral closest to x, rounding half toward even.
@@ -1052,13 +1052,13 @@
 
 static PyObject *
 float___round___impl(PyObject *self, PyObject *o_ndigits)
-/*[clinic end generated code: output=374c36aaa0f13980 input=1ca2316b510293b8]*/
+/*[clinic end generated code: output=374c36aaa0f13980 input=fc0fe25924fbc9ed]*/
 {
     double x, rounded;
     Py_ssize_t ndigits;
 
     x = PyFloat_AsDouble(self);
-    if (o_ndigits == NULL || o_ndigits == Py_None) {
+    if (o_ndigits == Py_None) {
         /* single-argument round or with None ndigits:
          * round to nearest integer */
         rounded = round(x);