diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index ace335ed87..0a1baff87d 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -214,7 +214,7 @@ module ActiveRecord
             if logger
               logger.warn "Exception occurred during reader method compilation."
               logger.warn "Maybe #{attr_name} is not a valid Ruby identifier?"
-              logger.warn "#{err.message}"
+              logger.warn err.message
             end
           end
         end