diff --git a/db/migrate/20130903123015_create_friendly_id_slugs.rb b/db/migrate/20130903123015_create_friendly_id_slugs.rb
index 48ce4de..c92a34b 100644
--- a/db/migrate/20130903123015_create_friendly_id_slugs.rb
+++ b/db/migrate/20130903123015_create_friendly_id_slugs.rb
@@ -8,7 +8,7 @@
       t.datetime :created_at
     end
     add_index :friendly_id_slugs, :sluggable_id
-    add_index :friendly_id_slugs, [:slug, :sluggable_type], :unique => true, :length => {:slug => 191, :sluggable_type => 191}
+    add_index :friendly_id_slugs, [:slug, :sluggable_type], :unique => true, :length => {:slug => 191, :sluggable_type => 40}
     add_index :friendly_id_slugs, :sluggable_type
   end