diff --git lib/bundler/shared_helpers.rb lib/bundler/shared_helpers.rb
index 50214901c5..a2843cba2c 100644
--- lib/bundler/shared_helpers.rb
+++ lib/bundler/shared_helpers.rb
@@ -340,7 +340,7 @@ def set_rubyopt
 
     def set_rubylib
       rubylib = (ENV["RUBYLIB"] || "").split(File::PATH_SEPARATOR)
-      rubylib.unshift bundler_ruby_lib
+      rubylib.unshift bundler_ruby_lib unless $LOAD_PATH.include?(bundler_ruby_lib )
       Bundler::SharedHelpers.set_env "RUBYLIB", rubylib.uniq.join(File::PATH_SEPARATOR)
     end