diff --git a/lib/mixin/required_sub_paths.rb b/lib/mixin/required_sub_paths.rb
index 38eb22b13..ef558b2ba 100644
--- a/lib/mixin/required_sub_paths.rb
+++ b/lib/mixin/required_sub_paths.rb
@@ -32,7 +32,7 @@ module Mixin
           sub_paths.push(sub_path)
         elsif sub_path =~ /\A(.*)\.rb\z/
           require_path = $1
-          require(require_path)
+          require_dependency(require_path)
         end
       end