diff --git a/railties/lib/rails/plugin.rb b/railties/lib/rails/plugin.rb
index dd840ef058..63864058ee 100644
--- a/railties/lib/rails/plugin.rb
+++ b/railties/lib/rails/plugin.rb
@@ -1,4 +1,5 @@
 require 'active_support/core_ext/kernel/reporting'
+require 'active_support/core_ext/symbol'
 require 'active_support/dependencies'
 
 module Rails