diff --git a/py/objtype.c b/py/objtype.c
index db99d407acfcd..b1fc347579b48 100644
--- a/py/objtype.c
+++ b/py/objtype.c
@@ -472,7 +472,22 @@ STATIC void mp_obj_instance_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *des
dest[0] = elem->value;
return;
}
-
+#if MICROPY_CPYTHON_COMPAT
+ if (attr == MP_QSTR___dict__) {
+ // Create a new dict with a copy of the instance's map items.
+ // This creates, unlike CPython, a 'read-only' __dict__: modifying
+ // it will not result in modifications to the actual instance members.
+ mp_map_t *map = &(self->members);
+ mp_obj_t attr_dict = mp_obj_new_dict(0);
+ for (mp_uint_t i = 0; i < map->alloc; ++i) {
+ if (MP_MAP_SLOT_IS_FILLED(map, i)) {
+ mp_obj_dict_store(attr_dict, map->table[i].key, map->table[i].value);
+ }
+ }
+ dest[0] = attr_dict;
+ return;
+ }
+#endif
struct class_lookup_data lookup = {
.obj = self,
.attr = attr,
diff --git a/py/qstrdefs.h b/py/qstrdefs.h
index 483c7537747c6..5efa9aa3bace3 100644
--- a/py/qstrdefs.h
+++ b/py/qstrdefs.h
@@ -46,6 +46,7 @@ Q(__locals__)
Q(__main__)
Q(__module__)
Q(__name__)
+Q(__dict__)
Q(__hash__)
Q(__next__)
Q(__qualname__)
diff --git a/tests/basics/builtin_dict.py b/tests/basics/builtin_dict.py
new file mode 100644
index 0000000000000..f51ec21d007ae
--- /dev/null
+++ b/tests/basics/builtin_dict.py
@@ -0,0 +1,11 @@
+class A:
+ def __init__(self):
+ self.a=1
+ self.b=2
+
+try:
+ d=A().__dict__
+ print(d['a'])
+ print(d['b'])
+except AttributeError:
+ print("SKIP")
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