diff --git a/lib/couchrest/more/extended_document.rb b/lib/couchrest/more/extended_document.rb
index 28f5359..aa1977b 100644
--- a/lib/couchrest/more/extended_document.rb
+++ b/lib/couchrest/more/extended_document.rb
@@ -14,7 +14,7 @@ module CouchRest
     include CouchRest::Mixins::ExtendedAttachments
     include CouchRest::Mixins::ClassProxy
     include CouchRest::Mixins::Collection
-		include CouchRest::Mixins::AttributeProtection
+    include CouchRest::Mixins::AttributeProtection
 
     def self.subclasses
       @subclasses ||= []