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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 34ef3b8f6e..6b692e6a9a 100644
--- a/activemodel/lib/active_model/validations.rb
+++ b/activemodel/lib/active_model/validations.rb
@@ -1,3 +1,5 @@
+require 'active_model/observing'
+
module ActiveModel
module Validations
def self.included(base) # :nodoc: