diff --git a/lib/impressionist/models/mongoid/impression.rb b/lib/impressionist/models/mongoid/impression.rb
index 5e10e337..73de29f9 100644
--- a/lib/impressionist/models/mongoid/impression.rb
+++ b/lib/impressionist/models/mongoid/impression.rb
@@ -6,7 +6,6 @@ class Impression
   include Mongoid::Timestamps
 
   include Impressionist::CounterCache
-  Impressionist::SetupAssociation.new(self).set
 
   field :impressionable_id, type: BSON::ObjectId
   field :impressionable_type
@@ -23,4 +22,5 @@ class Impression
 
   after_save :impressionable_counter_cache_updatable?
 
+  belongs_to :impressionable, polymorphic: true
 end
diff --git a/lib/impressionist/models/mongoid/impressionist/impressionable.rb b/lib/impressionist/models/mongoid/impressionist/impressionable.rb
index 4311d3b0..77ab63cf 100644
--- a/lib/impressionist/models/mongoid/impressionist/impressionable.rb
+++ b/lib/impressionist/models/mongoid/impressionist/impressionable.rb
@@ -1,8 +1,6 @@
 module Impressionist
   module Impressionable
-
-  # extends AS::Concern
-  include Impressionist::IsImpressionable
+    extend ActiveSupport::Concern
 
     # Overides impressionist_count in order to provide mongoid compability
     def impressionist_count(options={})
@@ -19,8 +17,19 @@ def impressionist_count(options={})
       # Count all distinct impressions unless the :all filter is provided
       distinct = options[:filter] != :all
       distinct ? imps.where(options[:filter].ne => nil).distinct(options[:filter]).count : imps.count
-    end
+    end    
+
+    module ClassMethods
+      def is_impressionable(options={})
+        has_many :impressions, 
+                 as: :impressionable, 
+                 dependent: :delete
 
+        @impressionist_cache_options = options
+
+        true
+      end
+    end
   end
 end