diff --git a/Gemfile.lock b/Gemfile.lock
index cf128fe3..b373ae96 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,7 @@ GIT
 PATH
   remote: .
   specs:
-    compass (0.11.beta.3.de86610)
+    compass (0.11.beta.3.2041ed0)
       chunky_png (~> 1.1.0)
       sass (>= 3.1.0.alpha.249)
 
diff --git a/lib/compass/configuration/helpers.rb b/lib/compass/configuration/helpers.rb
index 37fc478a..c10bfffa 100644
--- a/lib/compass/configuration/helpers.rb
+++ b/lib/compass/configuration/helpers.rb
@@ -65,11 +65,14 @@ module Compass
             Sass::Plugin.add_template_location sass_dir, css_dir
           end
         end
-        Sass::Plugin.on_updating_stylesheet do |sass_file, css_file|
-          Compass.configuration.run_callback(:stylesheet_saved, css_file)
-        end
-        Sass::Plugin.on_compilation_error do |e, filename, css|
-          Compass.configuration.run_callback(:stylesheet_error, filename, e.message)
+        unless defined?(CallbacksSetup)
+          Sass::Plugin.on_updating_stylesheet do |sass_file, css_file|
+            Compass.configuration.run_callback(:stylesheet_saved, css_file)
+          end
+          Sass::Plugin.on_compilation_error do |e, filename, css|
+            Compass.configuration.run_callback(:stylesheet_error, filename, e.message)
+          end
+          const_set('CallbacksSetup', true)
         end
       end
 
diff --git a/spec/sprites_spec.rb b/spec/sprites_spec.rb
index ec6555ea..d8944c03 100644
--- a/spec/sprites_spec.rb
+++ b/spec/sprites_spec.rb
@@ -6,7 +6,7 @@ describe Compass::Sprites do
   before :each do
     @images_src_path = File.join(File.dirname(__FILE__), 'test_project', 'public', 'images')
     @images_tmp_path = File.join(File.dirname(__FILE__), 'test_project', 'public', 'images-tmp')
-    FileUtils.cp_r @images_src_path, @images_tmp_path
+    ::FileUtils.cp_r @images_src_path, @images_tmp_path
     file = StringIO.new("images_path = #{@images_tmp_path.inspect}\n")
     Compass.add_configuration(file, "sprite_config")
     Compass.configure_sass_plugin!