diff --git a/lib/noosfero/api/session.rb b/lib/noosfero/api/session.rb
index 149af79..acef657 100644
--- a/lib/noosfero/api/session.rb
+++ b/lib/noosfero/api/session.rb
@@ -37,7 +37,6 @@ module Noosfero
         requires :password_confirmation, type: String, desc: _("Password confirmation")
       end
       post "/register" do
-        unique_attributes! User, [:email, :login]
         attrs = attributes_for_keys [:email, :login, :password, :password_confirmation] + environment.signup_person_fields
         remote_ip = (request.respond_to?(:remote_ip) && request.remote_ip) || (env && env['REMOTE_ADDR'])
 
diff --git a/test/unit/api/session_test.rb b/test/unit/api/session_test.rb
index 65e9a77..560ac26 100644
--- a/test/unit/api/session_test.rb
+++ b/test/unit/api/session_test.rb
@@ -32,11 +32,13 @@ class SessionTest < ActiveSupport::TestCase
     assert_equal 400, last_response.status
   end
 
-  should 'do not register a duplicated user' do
+  should 'not register a duplicated user' do
     params = {:login => "newuserapi", :password => "newuserapi", :password_confirmation => "newuserapi", :email => "newuserapi@email.com" }
     post "/api/v1/register?#{params.to_query}"
     post "/api/v1/register?#{params.to_query}"
     assert_equal 400, last_response.status
+    json = JSON.parse(last_response.body)
+    print "JSon: #{json}\n"
   end
 
 end
--
libgit2 0.21.2