diff --git a/railties/lib/rails/railtie.rb b/railties/lib/rails/railtie.rb
index f0991b99af..07a122e7d0 100644
--- a/railties/lib/rails/railtie.rb
+++ b/railties/lib/rails/railtie.rb
@@ -181,7 +181,7 @@ module Rails
 
     def load_tasks(app=self)
       extend Rake::DSL if defined? Rake::DSL
-      self.class.rake_tasks.each { |block| block.call(app) }
+      self.class.rake_tasks.each { |block| self.instance_exec(app, &block) }
 
       # load also tasks from all superclasses
       klass = self.class.superclass