3 files changed, 6 insertions, 3 deletions
diff --git a/activesupport/lib/active_support/deprecation/behaviors.rb b/activesupport/lib/active_support/deprecation/behaviors.rb
index feb1508586..f0842f201d 100644
--- a/activesupport/lib/active_support/deprecation/behaviors.rb
+++ b/activesupport/lib/active_support/deprecation/behaviors.rb
@@ -1,4 +1,5 @@
 require "active_support/notifications"
+require "active_support/core_ext/array/wrap"
 
 module ActiveSupport
   module Deprecation
@@ -11,7 +12,7 @@ module ActiveSupport
       end
 
       def behavior=(behavior)
-        @behavior = DEFAULT_BEHAVIORS[behavior] || behavior
+        @behavior = Array.wrap(behavior).map { |b| DEFAULT_BEHAVIORS[b] || b }
       end
     end
 
diff --git a/activesupport/lib/active_support/deprecation/reporting.rb b/activesupport/lib/active_support/deprecation/reporting.rb
index 03c445ffbf..49d58cd3a1 100644
--- a/activesupport/lib/active_support/deprecation/reporting.rb
+++ b/activesupport/lib/active_support/deprecation/reporting.rb
@@ -4,8 +4,9 @@ module ActiveSupport
       attr_accessor :silenced
 
       def warn(message = nil, callstack = caller)
-        if behavior && !silenced
-          behavior.call(deprecation_message(callstack, message), callstack)
+        return if silenced
+        deprecation_message(callstack, message).tap do |m|
+          behavior.each { |b| b.call(m, callstack) }
         end
       end
 
diff --git a/activesupport/lib/active_support/i18n_railtie.rb b/activesupport/lib/active_support/i18n_railtie.rb
index d82e54f1d4..db09919fd3 100644
--- a/activesupport/lib/active_support/i18n_railtie.rb
+++ b/activesupport/lib/active_support/i18n_railtie.rb
@@ -1,6 +1,7 @@
 require "active_support"
 require "rails"
 require "active_support/file_update_checker"
+require "active_support/core_ext/array/wrap"
 
 module I18n
   class Railtie < Rails::Railtie