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diff --git a/include/pybind11/attr.h b/include/pybind11/attr.h
index 1044db94..89d418cc 100644
--- a/include/pybind11/attr.h
+++ b/include/pybind11/attr.h
@@ -351,7 +351,8 @@ struct type_record {
bases.append((PyObject *) base_info->type);
-#if PY_VERSION_HEX < 0x030B0000
+// Keep in sync with enable_dynamic_attributes() in detail/class.h
+#if PY_VERSION_HEX < 0x030B0000 || defined(PYPY_VERSION)
dynamic_attr |= base_info->type->tp_dictoffset != 0;
#else
dynamic_attr |= (base_info->type->tp_flags & Py_TPFLAGS_MANAGED_DICT) != 0;
diff --git a/include/pybind11/detail/class.h b/include/pybind11/detail/class.h
index b990507d..e97d48b2 100644
--- a/include/pybind11/detail/class.h
+++ b/include/pybind11/detail/class.h
@@ -560,9 +560,9 @@ extern "C" inline int pybind11_clear(PyObject *self) {
inline void enable_dynamic_attributes(PyHeapTypeObject *heap_type) {
auto *type = &heap_type->ht_type;
type->tp_flags |= Py_TPFLAGS_HAVE_GC;
-#if PY_VERSION_HEX < 0x030B0000
- type->tp_dictoffset = type->tp_basicsize; // place dict at the end
- type->tp_basicsize += (ssize_t) sizeof(PyObject *); // and allocate enough space for it
+#if PY_VERSION_HEX < 0x030B0000 || defined(PYPY_VERSION) // For PyPy see PR #5508
+ type->tp_dictoffset = type->tp_basicsize; // place dict at the end
+ type->tp_basicsize += (ssize_t) sizeof(PyObject *); // and allocate enough space for it
#else
type->tp_flags |= Py_TPFLAGS_MANAGED_DICT;
#endif
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