diff --git a/lib/rubygems/defaults.rb b/lib/rubygems/defaults.rb
index ea84e5c018..60cfb24a57 100644
--- a/lib/rubygems/defaults.rb
+++ b/lib/rubygems/defaults.rb
@@ -41,6 +41,9 @@ module Gem
            end
 
     @default_dir ||= File.join(*path)
+  rescue
+    p ConfigMap
+    raise
   end
 
   ##