diff --git a/Misc/NEWS.d/next/C API/2022-06-07-17-08-35.gh-issue-93585.EfIKlx.rst b/Misc/NEWS.d/next/C API/2022-06-07-17-08-35.gh-issue-93585.EfIKlx.rst
new file mode 100644
index 000000000000000..76f431d5fdb5791
--- /dev/null
+++ b/Misc/NEWS.d/next/C API/2022-06-07-17-08-35.gh-issue-93585.EfIKlx.rst	
@@ -0,0 +1,6 @@
+Set ``PyCode_Type.tp_basicsize`` to ``sizeof(PyCodeObject)``. Cython makes the
+assumption that ``PyCode_Type.tp_basicsize`` equals to
+``sizeof(PyCodeObject)``. This assumption is no longer true since the commit
+2bde6827ea4f136297b2d882480b981ff26262b6. Restore ``tp_basicsize`` until the
+PyCodeObject structure can use a C99 flexible array of size zero with the
+syntax ``char co_code_adaptive[]``. Patch by Victor Stinner.
diff --git a/Objects/codeobject.c b/Objects/codeobject.c
index dc6dec1b2a549bc..2d4807d2e8c1385 100644
--- a/Objects/codeobject.c
+++ b/Objects/codeobject.c
@@ -1910,7 +1910,7 @@ static struct PyMethodDef code_methods[] = {
 PyTypeObject PyCode_Type = {
     PyVarObject_HEAD_INIT(&PyType_Type, 0)
     "code",
-    offsetof(PyCodeObject, co_code_adaptive),
+    sizeof(PyCodeObject),
     sizeof(_Py_CODEUNIT),
     (destructor)code_dealloc,           /* tp_dealloc */
     0,                                  /* tp_vectorcall_offset */