diff --git a/app/models/invoice.rb b/app/models/invoice.rb
index 261499a2..05c69dab 100644
--- a/app/models/invoice.rb
+++ b/app/models/invoice.rb
@@ -25,7 +25,6 @@ class Invoice < ActiveRecord::Base
   belongs_to :order
 
   validates_presence_of :supplier_id
-  validates_uniqueness_of :date, :scope => [:supplier_id]
 
   named_scope :unpaid, :conditions => { :paid_on => nil }