diff --git a/railties/lib/rails/generators/actions.rb b/railties/lib/rails/generators/actions.rb
index 71cb0b903b..cb3aca5811 100644
--- a/railties/lib/rails/generators/actions.rb
+++ b/railties/lib/rails/generators/actions.rb
@@ -4,6 +4,10 @@ require 'rbconfig'
 module Rails
   module Generators
     module Actions
+      def initialize(*) # :nodoc:
+        super
+        @in_group = nil
+      end
 
       # Adds an entry into Gemfile for the supplied gem.
       #