diff --git a/shared-module/vectorio/Polygon.c b/shared-module/vectorio/Polygon.c
index 5d1e0d3e58..d35d489c61 100644
--- a/shared-module/vectorio/Polygon.c
+++ b/shared-module/vectorio/Polygon.c
@@ -36,6 +36,7 @@ static void _clobber_points_list(vectorio_polygon_t *self, mp_obj_t points_tuple
     for (uint16_t i = 0; i < len; ++i) {
         size_t tuple_len = 0;
         mp_obj_t *tuple_items;
+        mp_arg_validate_type(items[i], &mp_type_tuple, MP_QSTR_point);
         mp_obj_tuple_get(items[i], &tuple_len, &tuple_items);
 
         mp_arg_validate_length(tuple_len, 2, MP_QSTR_point);