diff --git a/lib/noosfero/api/helpers.rb b/lib/noosfero/api/helpers.rb
index 247b771..20797ed 100644
--- a/lib/noosfero/api/helpers.rb
+++ b/lib/noosfero/api/helpers.rb
@@ -279,7 +279,7 @@
           end
         end
         if d[:provider] == 'serpro'
-          d[:verify_uri] ||= 'http://captcha2.servicoscorporativos.serpro.gov.br/captchavalidar/1.0.0/validar'
+          raise ArgumentError, "Environment api_captcha_settings verify_uri not defined" if d[:verify_uri].nil?
           return verify_serpro_captcha(d[:serpro_client_id], params[:txtToken_captcha_serpro_gov_br], params[:captcha_text], d[:verify_uri])
         end
         raise ArgumentError, "Environment api_captcha_settings provider not defined"
diff --git a/test/unit/api/helpers_test.rb b/test/unit/api/helpers_test.rb
index 1a8e99f..4303568 100644
--- a/test/unit/api/helpers_test.rb
+++ b/test/unit/api/helpers_test.rb
@@ -207,6 +207,7 @@ class APIHelpersTest < ActiveSupport::TestCase
         enabled: true,
         provider: 'serpro',
         serpro_client_id:  '0000000000000000',
+        verify_uri:   'http://localhost/api/verify',
     }
     assert_equal test_captcha("127.0.0.1", {}, environment), "Missing captcha data"
   end
--
libgit2 0.21.2