Prefix ARRAY_SIZE with micropython prefix MP_
diff --git a/py/modsys.c b/py/modsys.c
index a99db1b..519d470 100644
--- a/py/modsys.c
+++ b/py/modsys.c
@@ -87,8 +87,8 @@
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_sys_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_sys_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_sys_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_sys_globals_table),
         .table = (mp_map_elem_t*)mp_module_sys_globals_table,
     },
 };