diff --git a/test/unit/project_nested_set_test.rb b/test/unit/project_nested_set_test.rb
index c603acb..6207f9f 100644
--- a/test/unit/project_nested_set_test.rb
+++ b/test/unit/project_nested_set_test.rb
@@ -176,7 +176,7 @@ class ProjectNestedSetTest < ActiveSupport::TestCase
     projects.each do |project|
       if project.children.any?
         # sibling projects sorted alphabetically
-        assert_equal project.children.map(&:name).sort, project.children.order('lft').map(&:name), "Project #{project.name}'s children were not properly sorted"
+        assert_equal project.children.map(&:name).sort, project.children.sort_by(&:lft).map(&:name), "Project #{project.name}'s children were not properly sorted"
       end
     end
   end