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-rw-r--r--activesupport/lib/active_support/values/time_zone.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/values/time_zone.rb b/activesupport/lib/active_support/values/time_zone.rb
index 3aa135c28f..c67af60926 100644
--- a/activesupport/lib/active_support/values/time_zone.rb
+++ b/activesupport/lib/active_support/values/time_zone.rb
@@ -169,7 +169,7 @@ class TimeZone
# A regular expression that matches the names of all time zones in
# the USA.
- US_ZONES = /US|Arizona|Indiana|Hawaii|Alaska/
+ US_ZONES = /US|Arizona|Indiana|Hawaii|Alaska/ unless defined?(US_ZONES)
# A convenience method for returning a collection of TimeZone objects
# for time zones in the USA.