diff --git a/lib/private_institution.rb b/lib/private_institution.rb
index 43c554a..db490d2 100644
--- a/lib/private_institution.rb
+++ b/lib/private_institution.rb
@@ -1,3 +1,2 @@
 class PrivateInstitution < Institution
-  validates :cnpj, :allow_nil=>true, :allow_blank=>true
 end
diff --git a/test/unit/private_institution_test.rb b/test/unit/private_institution_test.rb
index c87f6d3..8f01e95 100644
--- a/test/unit/private_institution_test.rb
+++ b/test/unit/private_institution_test.rb
@@ -25,21 +25,6 @@ class PrivateInstitutionTest < ActiveSupport::TestCase
     assert @institution.save
   end
 
-  should "not save with a repeated cnpj" do
-    msg = "Cnpj has already been taken"
-    assert @institution.save
-    sec_institution = create_private_institution(
-                        "Another Private Institution",
-                        "API",
-                        "BR",
-                        "DF",
-                        "Gama",
-                        "00.000.000/0001-00"
-                      )
-
-    assert sec_institution.errors.full_messages.include? msg
-  end
-
   should "save without fantasy name" do
     @institution.acronym = nil
     @institution.community.save
--
libgit2 0.21.2