diff --git a/actionpack/lib/action_controller/metal/flash.rb b/actionpack/lib/action_controller/metal/flash.rb
index b2d44c6c63..9d08ed6081 100644
--- a/actionpack/lib/action_controller/metal/flash.rb
+++ b/actionpack/lib/action_controller/metal/flash.rb
@@ -149,6 +149,7 @@ module ActionController #:nodoc:
 
   protected
     def process_action(method_name)
+      @_flash = nil
       super
       @_flash.store(session) if @_flash
       @_flash = nil