diff --git a/src/noosfero-spb/gov_user/lib/public_institution.rb b/src/noosfero-spb/gov_user/lib/public_institution.rb
index ffc4677..142852b 100644
--- a/src/noosfero-spb/gov_user/lib/public_institution.rb
+++ b/src/noosfero-spb/gov_user/lib/public_institution.rb
@@ -2,8 +2,7 @@ class PublicInstitution < Institution
   validates :governmental_power, :governmental_sphere, :juridical_nature,
             :presence=>true
 
-  validates :acronym, :allow_blank => true, :allow_nil => true,
-            :uniqueness=>true
+  validates :acronym, :allow_blank => true, :allow_nil => true
 
   validates :cnpj,
             :format => {with: CNPJ_FORMAT},
--
libgit2 0.21.2