1 files changed, 3 insertions, 3 deletions
diff --git a/py/objstr.c b/py/objstr.c
index 00586a3b3b..3ace7b051a 100644
--- a/py/objstr.c
+++ b/py/objstr.c
@@ -161,7 +161,7 @@ STATIC mp_obj_t bytes_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const m
 
     mp_obj_t iterable = rt_getiter(args[0]);
     mp_obj_t item;
-    while ((item = rt_iternext(iterable)) != mp_const_stop_iteration) {
+    while ((item = rt_iternext(iterable)) != MP_OBJ_NULL) {
         if (len == -1) {
             vstr_add_char(vstr, MP_OBJ_SMALL_INT_VALUE(item));
         } else {
@@ -877,7 +877,7 @@ STATIC mp_obj_t str_it_iternext(mp_obj_t self_in) {
         self->cur += 1;
         return o_out;
     } else {
-        return mp_const_stop_iteration;
+        return MP_OBJ_NULL;
     }
 }
 
@@ -895,7 +895,7 @@ STATIC mp_obj_t bytes_it_iternext(mp_obj_t self_in) {
         self->cur += 1;
         return o_out;
     } else {
-        return mp_const_stop_iteration;
+        return MP_OBJ_NULL;
     }
 }