diff --git a/activerecord/lib/active_record/middleware/database_selector/resolver.rb b/activerecord/lib/active_record/middleware/database_selector/resolver.rb
index 1c98d7d1eb2beecd36379f818960daab51c4ddc8..96f1b8e9a42aa4cc70a1867a73ec9c0295506572 100644
--- a/activerecord/lib/active_record/middleware/database_selector/resolver.rb
+++ b/activerecord/lib/active_record/middleware/database_selector/resolver.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "active_record/middleware/database_selector/resolver/session"
+require "active_support/core_ext/numeric/time"
 
 module ActiveRecord
   module Middleware