diff --git a/announcement.gemspec b/announcement.gemspec
index 80c4c6c..4acefb5 100644
--- a/announcement.gemspec
+++ b/announcement.gemspec
@@ -11,13 +11,13 @@ if bundle_update_flag
     require ::File.expand_path('app/helpers/bundler_helper.rb',  env_pwd)
     extend BundlerHelper
   rescue LoadError
-    def bundler_with_clean_env
+    def bundler_with_clean_env(&block)
       if block_given?
-          if Bundler.respond_to?(:with_unbundled_env)
-              Bundler.with_unbundled_env(&Proc.new)
-          else
-              Bundler.with_clean_env(&Proc.new)
-          end
+        if Bundler.respond_to?(:with_unbundled_env)
+          Bundler.with_unbundled_env(&block)
+        else
+          Bundler.with_clean_env(&block)
+        end
       end
     end
   end