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-rw-r--r--activemodel/lib/active_model/validations.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/validations.rb b/activemodel/lib/active_model/validations.rb
index 5223cea135..54a869396d 100644
--- a/activemodel/lib/active_model/validations.rb
+++ b/activemodel/lib/active_model/validations.rb
@@ -1,5 +1,7 @@
require 'active_support/core_ext/array/extract_options'
require 'active_support/core_ext/hash/keys'
+require 'active_support/concern'
+require 'active_support/callbacks'
module ActiveModel
module Validations