diff --git a/lib/bundler/runtime.rb b/lib/bundler/runtime.rb
index 6ae2f1cdc85..d1d0f8cf978 100644
--- a/lib/bundler/runtime.rb
+++ b/lib/bundler/runtime.rb
@@ -224,11 +224,7 @@ def setup_environment
       rubyopt = [ENV["RUBYOPT"]].compact
       if rubyopt.empty? || rubyopt.first !~ /-rbundler\/setup/
         rubyopt.unshift %|-rbundler/setup|
-        if Bundler::WINDOWS
-          rubyopt.unshift %|"-I#{File.expand_path('../..', __FILE__)}"|
-        else
-          rubyopt.unshift %|-I#{File.expand_path('../..', __FILE__)}|
-        end
+        rubyopt.unshift %|-I#{File.expand_path('../..', __FILE__)}|
         ENV["RUBYOPT"] = rubyopt.join(' ')
       end
     end