1 files changed, 5 insertions, 4 deletions
diff --git a/activemodel/lib/active_model/validations.rb b/activemodel/lib/active_model/validations.rb
index 64343f7a5c..336c2757fc 100644
--- a/activemodel/lib/active_model/validations.rb
+++ b/activemodel/lib/active_model/validations.rb
@@ -1,9 +1,10 @@
 module ActiveModel
   module Validations
-    def self.included(base) # :nodoc:
-      base.extend(ClassMethods)
-      base.__send__(:include, ActiveSupport::Callbacks)
-      base.define_callbacks :validate
+    extend ActiveSupport::Concern
+    include ActiveSupport::Callbacks
+
+    included do
+      define_callbacks :validate
     end
 
     module ClassMethods