diff --git a/lib/draper/collection_decorator.rb b/lib/draper/collection_decorator.rb
index 2eb2143..67d29ae 100644
--- a/lib/draper/collection_decorator.rb
+++ b/lib/draper/collection_decorator.rb
@@ -74,7 +74,7 @@ module Draper
     def kind_of?(klass)
       decorated_collection.kind_of?(klass) || super
     end
-    alias :is_a? :kind_of?
+    alias_method :is_a?, :kind_of?
 
     protected