diff --git a/activemodel/lib/active_model/observing.rb b/activemodel/lib/active_model/observing.rb
index 868396330b..7bad2397ae 100644
--- a/activemodel/lib/active_model/observing.rb
+++ b/activemodel/lib/active_model/observing.rb
@@ -58,6 +58,12 @@ module ActiveModel
           notify_observers :observed_class_inherited, subclass
         end
     end
+
+    private
+      def notify(method) #:nodoc:
+        self.class.changed
+        self.class.notify_observers(method, self)
+      end
   end
 
   class Observer
diff --git a/activerecord/lib/active_record/callbacks.rb b/activerecord/lib/active_record/callbacks.rb
index 36f5f2ce47..01e41c04df 100644
--- a/activerecord/lib/active_record/callbacks.rb
+++ b/activerecord/lib/active_record/callbacks.rb
@@ -353,10 +353,5 @@ module ActiveRecord
 
         return result
       end
-
-      def notify(method) #:nodoc:
-        self.class.changed
-        self.class.notify_observers(method, self)
-      end
   end
 end