diff --git a/app/models/unit.rb b/app/models/unit.rb
index 8923c66..d3e923a 100644
--- a/app/models/unit.rb
+++ b/app/models/unit.rb
@@ -2,5 +2,5 @@ class Unit < ActiveRecord::Base
   belongs_to :project
 
   validates :project, associated: true
-  validates :name, :shortname, presence: true
+  validates :name, :shortname, presence: true, uniqueness: true
 end