diff --git a/py/objarray.h b/py/objarray.h
new file mode 100644
index 0000000000..620426ce37
--- /dev/null
+++ b/py/objarray.h
@@ -0,0 +1,3 @@
+MP_DECLARE_CONST_FUN_OBJ(mp_builtin_bytearray_obj);
+
+mp_obj_t mp_obj_new_bytearray(uint n, void *items);