diff --git a/Lib/test/test__interpreters.py b/Lib/test/test__interpreters.py
index 7fba16bafbac37..ec376773e40f62 100644
--- a/Lib/test/test__interpreters.py
+++ b/Lib/test/test__interpreters.py
@@ -746,6 +746,12 @@ def test_bytes_for_script(self):
with self.assertRaises(TypeError):
_interpreters.run_string(self.id, b'print("spam")')
+ def test_str_subclass_string(self):
+ class StrSubclass(str): pass
+
+ output = _run_output(self.id, StrSubclass('print(1 + 2)'))
+ self.assertEqual(output, '3\n')
+
def test_with_shared(self):
r, w = os.pipe()
diff --git a/Misc/NEWS.d/next/Library/2025-04-06-23-09-21.gh-issue-132171.zZqvfn.rst b/Misc/NEWS.d/next/Library/2025-04-06-23-09-21.gh-issue-132171.zZqvfn.rst
new file mode 100644
index 00000000000000..89f34fa3168cae
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-04-06-23-09-21.gh-issue-132171.zZqvfn.rst
@@ -0,0 +1 @@
+Fix crash of ``_interpreters.run_string`` on string subclasses.
diff --git a/Modules/_interpretersmodule.c b/Modules/_interpretersmodule.c
index 707e654005bc59..38bd038b6b9205 100644
--- a/Modules/_interpretersmodule.c
+++ b/Modules/_interpretersmodule.c
@@ -330,7 +330,7 @@ get_code_str(PyObject *arg, Py_ssize_t *len_p, PyObject **bytes_p, int *flags_p)
int flags = 0;
if (PyUnicode_Check(arg)) {
- assert(PyUnicode_CheckExact(arg)
+ assert(PyUnicode_Check(arg)
&& (check_code_str((PyUnicodeObject *)arg) == NULL));
codestr = PyUnicode_AsUTF8AndSize(arg, &len);
if (codestr == NULL) {
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