diff --git a/lib/sinatra/base.rb b/lib/sinatra/base.rb
index b21d88ba..7841a9b9 100644
--- a/lib/sinatra/base.rb
+++ b/lib/sinatra/base.rb
@@ -360,6 +360,7 @@ module Sinatra
     end
 
     def initialize
+      super
       @default_layout = :layout
     end