1 files changed, 2 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb b/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb
index e4d22516c1..2b8e2b544f 100644
--- a/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb
+++ b/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb
@@ -159,7 +159,7 @@ class Class
   #   (error out or do the same as other methods above) instead of silently
   #   moving on). In particular, this makes the return value of this function
   #   less useful.
-  def extlib_inheritable_reader(*ivars)
+  def extlib_inheritable_reader(*ivars, &block)
     options = ivars.extract_options!
 
     ivars.each do |ivar|
@@ -178,6 +178,7 @@ class Class
           end
         RUBY
       end
+      instance_variable_set(:"@#{ivar}", yield) if block_given?
     end
   end