2 files changed, 8 insertions, 0 deletions
diff --git a/py/objreversed.c b/py/objreversed.c
index 4ddb218074..0d5332d002 100644
--- a/py/objreversed.c
+++ b/py/objreversed.c
@@ -39,6 +39,13 @@ typedef struct _mp_obj_reversed_t {
 STATIC mp_obj_t reversed_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
     mp_arg_check_num(n_args, n_kw, 1, 1, false);
 
+    // check if __reversed__ exists, and if so delegate to it
+    mp_obj_t dest[2];
+    mp_load_method_maybe(args[0], MP_QSTR___reversed__, dest);
+    if (dest[0] != MP_OBJ_NULL) {
+        return mp_call_method_n_kw(0, 0, dest);
+    }
+
     mp_obj_reversed_t *o = m_new_obj(mp_obj_reversed_t);
     o->base.type = type_in;
     o->seq = args[0];
diff --git a/py/qstrdefs.h b/py/qstrdefs.h
index 71a523c2d6..23c25072d9 100644
--- a/py/qstrdefs.h
+++ b/py/qstrdefs.h
@@ -74,6 +74,7 @@ Q(__gt__)
 Q(__eq__)
 Q(__le__)
 Q(__ge__)
+Q(__reversed__)
 
 Q(micropython)
 Q(bytecode)