diff --git a/app/models/category.rb b/app/models/category.rb
index 54cd160..e537d58 100644
--- a/app/models/category.rb
+++ b/app/models/category.rb
@@ -1,6 +1,6 @@
 class Category < ActiveRecord::Base
 
-  validates_exclusion_of :slug, :in => [ 'index'], :message => N_('%{fm} cannot be like that.')
+  validates_exclusion_of :slug, :in => [ 'index' ], :message => N_('%{fn} cannot be like that.')
   validates_presence_of :name, :environment_id
   validates_uniqueness_of :slug,:scope => [ :environment_id, :parent_id ], :message => N_('%{fn} is already being used by another category.')
   belongs_to :environment
--
libgit2 0.21.2