diff --git a/lib/rails_admin/extensions/paper_trail/auditing_adapter.rb b/lib/rails_admin/extensions/paper_trail/auditing_adapter.rb
index 1a69cdab26..81594abced 100644
--- a/lib/rails_admin/extensions/paper_trail/auditing_adapter.rb
+++ b/lib/rails_admin/extensions/paper_trail/auditing_adapter.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/string/strip'
+
 module RailsAdmin
   module Extensions
     module PaperTrail