1 files changed, 3 insertions, 1 deletions
diff --git a/py/obj.c b/py/obj.c
index 555a4a8b9..34ecdab84 100644
--- a/py/obj.c
+++ b/py/obj.c
@@ -33,6 +33,7 @@
 #include "py/obj.h"
 #include "py/objtype.h"
 #include "py/objint.h"
+#include "py/objstr.h"
 #include "py/runtime0.h"
 #include "py/runtime.h"
 #include "py/stackctrl.h"
@@ -422,7 +423,8 @@ mp_obj_t mp_obj_len_maybe(mp_obj_t o_in) {
         MP_OBJ_IS_STR(o_in) ||
 #endif
         MP_OBJ_IS_TYPE(o_in, &mp_type_bytes)) {
-        return MP_OBJ_NEW_SMALL_INT(mp_obj_str_get_len(o_in));
+        GET_STR_LEN(o_in, l);
+        return MP_OBJ_NEW_SMALL_INT(l);
     } else {
         mp_obj_type_t *type = mp_obj_get_type(o_in);
         if (type->unary_op != NULL) {