diff --git a/src/noosfero-spb/gov_user/lib/institution.rb b/src/noosfero-spb/gov_user/lib/institution.rb
index 1f5df5c..13677d4 100644
--- a/src/noosfero-spb/gov_user/lib/institution.rb
+++ b/src/noosfero-spb/gov_user/lib/institution.rb
@@ -23,6 +23,7 @@ class Institution < ActiveRecord::Base
                   :corporate_name, :siorg_code, :community
 
   validates :name, :presence=>true, :uniqueness=>true
+  validates :cnpj, :presence=>true, :uniqueness=>true
 
   before_save :verify_institution_type
 
diff --git a/src/noosfero-spb/gov_user/views/gov_user_plugin/_institution.html.erb b/src/noosfero-spb/gov_user/views/gov_user_plugin/_institution.html.erb
index 9cb18bd..ac44b0c 100644
--- a/src/noosfero-spb/gov_user/views/gov_user_plugin/_institution.html.erb
+++ b/src/noosfero-spb/gov_user/views/gov_user_plugin/_institution.html.erb
@@ -105,7 +105,10 @@
 
     <div class="spb-row">
       <div class="spb-col spb-col-12">
-        <%= inst.label("cnpj" ,_("CNPJ"), :class=>"formlabel") %>
+         <label class="formlabel" for="institutions_cnpj">
+          <%= _("CNPJ") %>
+          <span class="required-field">(*)</span>
+        </label>
         <%= inst.text_field(:cnpj, :placeholder=>"99.999.999/9999-99", :class=>"intitution_cnpj_field", :value => params[:institutions][:cnpj]) %>
       </div>
     </div>
@@ -151,7 +154,7 @@
         <%= inst.select(:juridical_nature, @juridical_nature, :selected=>params[:institutions][:juridical_nature], :class => flash[:error_institution_juridical_nature])%>
       </div>
     </div>
-
+    
     <div class="spb-row public-institutions-fields">
       <div class="spb-col spb-col-12">
         <%= _("SISP ?") %>
--
libgit2 0.21.2