diff --git a/unittests/list_resize.chai b/unittests/list_resize.chai
index f34e77a..0d6f05c 100644
--- a/unittests/list_resize.chai
+++ b/unittests/list_resize.chai
@@ -6,7 +6,7 @@ list.resize(2);
 assert_equal(list.size(), 2);
 
 list.resize(6, "AAA");
-assert_equal(list[5], "AAA");
+assert_equal(list.back(), "AAA");
 
 list.resize(0);
 assert_equal(list.size(), 0);