diff --git a/do-not-use-pytuple-get-size.patch b/do-not-use-pytuple-get-size.patch
new file mode 100644
index 0000000..999e9da
--- /dev/null
+++ b/do-not-use-pytuple-get-size.patch
@@ -0,0 +1,53 @@
+From 338044cbf771e5665a744d3b36b5d7edd126d16a Mon Sep 17 00:00:00 2001
+From: Zaur Shibzukhov <szport@gmail.com>
+Date: Mon, 31 Mar 2025 10:00:01 +0300
+Subject: [PATCH] Fix #13 with litelist/litetuple get_subscript routine
+
+---
+ examples/performance_cgc.ipynb | 32 ++++++++++++++++----------------
+ lib/recordclass/_litelist.c    |  4 ++--
+ lib/recordclass/_litetuple.c   |  4 ++--
+ 3 files changed, 20 insertions(+), 20 deletions(-)
+
+Index: recordclass-0.22.1/lib/recordclass/_litelist.c
+===================================================================
+--- recordclass-0.22.1.orig/lib/recordclass/_litelist.c
++++ recordclass-0.22.1/lib/recordclass/_litelist.c
+@@ -484,13 +484,13 @@ litelist_subscript(PyLiteListObject* sel
+     if (PySlice_Check(item)) {
+         Py_ssize_t start, stop, step, slicelength;
+ 
+-        if (PySlice_GetIndicesEx(item, (PyTuple_GET_SIZE(self)), &start, &stop, &step, &slicelength) < 0)
++        if (PySlice_GetIndicesEx(item, (Py_SIZE(self)), &start, &stop, &step, &slicelength) < 0)
+             return NULL;
+         return litelist_slice(self, start, stop);
+     }
+     else {
+         PyErr_Format(PyExc_TypeError,
+-                     "subscript must be integer, slice or string, but not %.200s",
++                     "subscript must be integer or slice, but not %.200s",
+                      Py_TYPE(item)->tp_name);
+         return NULL;
+     }
+Index: recordclass-0.22.1/lib/recordclass/_litetuple.c
+===================================================================
+--- recordclass-0.22.1.orig/lib/recordclass/_litetuple.c
++++ recordclass-0.22.1/lib/recordclass/_litetuple.c
+@@ -32,7 +32,7 @@ static PyTypeObject PyMLiteTuple_Type;
+ 
+ #define PyLiteTuple_GET_ITEM(op, i) (((PyLiteTupleObject *)(op))->ob_item[i])
+ #define PyLiteTuple_SET_ITEM(op, i, v) (((PyLiteTupleObject *)(op))->ob_item[i] = v)
+-#define PyLiteTuple_GET_SIZE(seq) PyTuple_GET_SIZE(seq)
++#define PyLiteTuple_GET_SIZE(seq) Py_SIZE(seq)
+ 
+ #define PyLiteTuple_CheckExact(op) (Py_TYPE(op) == &PyLiteTuple_Type || Py_TYPE(op) == &PyMLiteTuple_Type)
+ #define PyLiteTuple_Check(op) (PyLiteTuple_CheckExact(op) || PyObject_IsInstance(op, (PyObject*)&PyLiteTuple_Type) || PyObject_IsInstance(op, (PyObject*)&PyMLiteTuple_Type))
+@@ -417,7 +417,7 @@ litetuple_subscript(PyLiteTupleObject* s
+     if (PySlice_Check(item)) {
+         Py_ssize_t start, stop, step, slicelength;
+ 
+-        if (PySlice_GetIndicesEx(item, (PyTuple_GET_SIZE(self)), &start, &stop, &step, &slicelength) < 0)
++        if (PySlice_GetIndicesEx(item, (Py_SIZE(self)), &start, &stop, &step, &slicelength) < 0)
+             return NULL;
+         return litetuple_slice(self, start, stop);
+     }
diff --git a/python-recordclass.changes b/python-recordclass.changes
index b495462..6bb9a3b 100644
--- a/python-recordclass.changes
+++ b/python-recordclass.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Fri Apr  4 00:56:20 UTC 2025 - Steve Kowalik <steven.kowalik@suse.com>
+
+- Add patch do-not-use-pytuple-get-size.patch:
+  * Use Py_SIZE rather than PyTuple_GET_SIZE to avoid assertion failures.
+
 -------------------------------------------------------------------
 Mon Aug  5 19:05:39 UTC 2024 - Dirk Müller <dmueller@suse.com>
 
diff --git a/python-recordclass.spec b/python-recordclass.spec
index e0b1363..36ce8b4 100644
--- a/python-recordclass.spec
+++ b/python-recordclass.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package python-recordclass
 #
-# Copyright (c) 2024 SUSE LLC
+# Copyright (c) 2025 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -16,7 +16,6 @@
 #
 
 
-%{?!python_module:%define python_module() python-%{**} python3-%{**}}
 Name:           python-recordclass
 Version:        0.22.1
 Release:        0
@@ -24,6 +23,8 @@ Summary:        Library implementing a mutable variant of namedtuple
 License:        MIT
 URL:            https://github.com/intellimath/recordclass
 Source:         https://files.pythonhosted.org/packages/source/r/recordclass/recordclass-%{version}.tar.gz
+# PATCH-FIX-UPSTREAM Based on gh#intellimath/recordclass#338044cbf771e5665a744d3b36b5d7edd126d16a
+Patch0:         do-not-use-pytuple-get-size.patch
 BuildRequires:  %{python_module devel}
 BuildRequires:  %{python_module pip}
 BuildRequires:  %{python_module setuptools}
@@ -41,7 +42,7 @@ Mutable variant of namedtuple -- recordclass, which support assignments, and
 other memory saving variants.
 
 %prep
-%setup -q -n recordclass-%{version}
+%autosetup -p1 -n recordclass-%{version}
 
 %build
 export CFLAGS="%{optflags}"