diff --git a/lib/kaminari/hooks.rb b/lib/kaminari/hooks.rb
index 514ae7f..d330d31 100644
--- a/lib/kaminari/hooks.rb
+++ b/lib/kaminari/hooks.rb
@@ -8,6 +8,7 @@ module Kaminari
 
       begin; require 'data_mapper'; rescue LoadError; end
       if defined? ::DataMapper
+        require 'dm-aggregates'
         require 'kaminari/models/data_mapper_extension'
         ::DataMapper::Collection.send :include, Kaminari::DataMapperExtension::Collection
         ::DataMapper::Model.append_extensions Kaminari::DataMapperExtension::Model