diff --git a/lib/sinatra/decorator/decoratable.rb b/lib/sinatra/decorator/decoratable.rb
index 77c58fd..03d4d27 100644
--- a/lib/sinatra/decorator/decoratable.rb
+++ b/lib/sinatra/decorator/decoratable.rb
@@ -2,6 +2,7 @@ module Sinatra
   module Decorator
     module Decoratable
       def decorate(options = {})
+        return @decorator if @decorator
 
         klass = options[:as]
         klass_name = "#{self.class}Decorator"
@@ -9,7 +10,7 @@ def decorate(options = {})
         decorator = klass.new(self, context: self)
 
         yield decorator if block_given?
-        decorator
+        @decorator = decorator
       end
     end # Decoratable
   end # Decorator