diff --git a/guides/source/active_record_postgresql.md b/guides/source/active_record_postgresql.md
index fe112a47089e579499993d6dd228a9de8c1e7d7c..9d495dfacbcee1c139ac82ad708accd7997888d1 100644
--- a/guides/source/active_record_postgresql.md
+++ b/guides/source/active_record_postgresql.md
@@ -252,7 +252,7 @@ extension to use uuid.
 ```ruby
 # db/migrate/20131220144913_create_revisions.rb
 create_table :revisions do |t|
-  t.column :identifier, :uuid
+  t.uuid :identifier
 end
 
 # app/models/revision.rb