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-rw-r--r--activesupport/lib/active_support/file_update_checker.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/file_update_checker.rb b/activesupport/lib/active_support/file_update_checker.rb
index 43e8b7c528..b5667b6ac8 100644
--- a/activesupport/lib/active_support/file_update_checker.rb
+++ b/activesupport/lib/active_support/file_update_checker.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/time/calculations'
+
module ActiveSupport
# FileUpdateChecker specifies the API used by Rails to watch files
# and control reloading. The API depends on four methods: