2 files changed, 3 insertions, 1 deletions
diff --git a/Misc/NEWS b/Misc/NEWS
index 579c37a..fa2968b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -13,6 +13,8 @@ Core and Builtins
 Library
 -------
 
+- Fixed cmath.isinf's name in its argument parsing code.
+
 - Issue #20311, #20452: poll and epoll now round the timeout away from zero,
   instead of rounding towards zero, in select and selectors modules:
   select.epoll.poll(), selectors.PollSelector.poll() and
diff --git a/Modules/cmathmodule.c b/Modules/cmathmodule.c
index 36bf4a1..91b369a 100644
--- a/Modules/cmathmodule.c
+++ b/Modules/cmathmodule.c
@@ -1060,7 +1060,7 @@ static PyObject *
 cmath_isinf(PyObject *self, PyObject *args)
 {
     Py_complex z;
-    if (!PyArg_ParseTuple(args, "D:isnan", &z))
+    if (!PyArg_ParseTuple(args, "D:isinf", &z))
         return NULL;
     return PyBool_FromLong(Py_IS_INFINITY(z.real) ||
                            Py_IS_INFINITY(z.imag));