diff --git a/lib/active_admin/xls/resource_controller_extension.rb b/lib/active_admin/xls/resource_controller_extension.rb
index 69a248e..21a5ec0 100644
--- a/lib/active_admin/xls/resource_controller_extension.rb
+++ b/lib/active_admin/xls/resource_controller_extension.rb
@@ -23,7 +23,7 @@ def index_with_xls(&block)
       # patching per_page to use the CSV record max for pagination when the format is xls
       def per_page_with_xls
         if request.format ==  Mime::Type.lookup_by_extension(:xls)
-          return max_per_page
+          return respond_to?(:max_per_page) ? max_per_page : active_admin_config.max_per_page
         end
 
         per_page_without_xls