diff --git a/lib/sequel/plugins/audit_by_day.rb b/lib/sequel/plugins/audit_by_day.rb
index 8b10bd6..834b5bd 100644
--- a/lib/sequel/plugins/audit_by_day.rb
+++ b/lib/sequel/plugins/audit_by_day.rb
@@ -57,7 +57,7 @@ def audit(master, previous_values, updated_values, update_time, updated_by)
                 attrs[column] = nil
               end
             end
-            attrs["#{column_name}_at"] = ::Sequel::Plugins::Bitemporal.point_in_time
+            attrs["#{column_name}_updated_at"] = ::Sequel::Plugins::Bitemporal.point_in_time
           end
           audit_for_day.update_attributes attrs.merge(valid_from: audit_default_valid_from)
         end