diff --git a/lib/completeness-fu/active_model_additions.rb b/lib/completeness-fu/active_model_additions.rb
index 3f1a5c9..1e54f03 100644
--- a/lib/completeness-fu/active_model_additions.rb
+++ b/lib/completeness-fu/active_model_additions.rb
@@ -1,6 +1,11 @@
-require 'active_support/core_ext/class/inheritable_attributes'
+if Gem.loaded_specs['activesupport'].version > Gem::Version.create('3.2.0.pre') # ActiveSupport 3.2
+	require 'active_support/core_ext/class/attribute'
+else # ActiveSupport 3.0, 3.1                      
+	require 'active_support/core_ext/class/inheritable_attributes'
+end
 require 'active_support/core_ext/class/attribute_accessors'
 
+
 module CompletenessFu
 
   module ActiveModelAdditions