diff --git a/load_paths.rb b/load_paths.rb
index 873315f978..8f37364629 100644
--- a/load_paths.rb
+++ b/load_paths.rb
@@ -4,7 +4,7 @@ rescue LoadError
   begin
     # bust gem prelude
     if defined? Gem
-      Gem.cache
+      Gem.source_index
       gem 'bundler'
     else
       require 'rubygems'