diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py
index d299c34cec076d..41b973da2c7df0 100644
--- a/Lib/test/test_long.py
+++ b/Lib/test/test_long.py
@@ -1639,6 +1639,8 @@ class MyInt(int):
MyInt.__basicsize__ + MyInt.__itemsize__ * ndigits
)
+ # GH-117195 -- This shouldn't crash
+ object.__sizeof__(1)
if __name__ == "__main__":
unittest.main()
diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-03-25-15-07-01.gh-issue-117195.OWakgD.rst b/Misc/NEWS.d/next/Core and Builtins/2024-03-25-15-07-01.gh-issue-117195.OWakgD.rst
new file mode 100644
index 00000000000000..ae1e5acc5c333b
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2024-03-25-15-07-01.gh-issue-117195.OWakgD.rst
@@ -0,0 +1,2 @@
+Avoid assertion failure for debug builds when calling
+``object.__sizeof__(1)``
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index b7c3fcf47f23fc..4af49714b492fd 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -7037,8 +7037,11 @@ object___sizeof___impl(PyObject *self)
res = 0;
isize = Py_TYPE(self)->tp_itemsize;
- if (isize > 0)
- res = Py_SIZE(self) * isize;
+ if (isize > 0) {
+ /* This assumes that ob_size is valid if tp_itemsize is not 0,
+ which isn't true for PyLongObject. */
+ res = _PyVarObject_CAST(self)->ob_size * isize;
+ }
res += Py_TYPE(self)->tp_basicsize;
return PyLong_FromSsize_t(res);
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