diff --git a/app/models/user.rb b/app/models/user.rb
index 113781ef1..e8b885e0d 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -26,7 +26,7 @@ class User < ActiveRecord::Base
   belongs_to :geozone
 
   validates :username, presence: true, if: :username_required?
-  validates :username, uniqueness: true, if: :username_required?
+  validates :username, uniqueness: { scope: :registering_with_oauth }, if: :username_required?
   validates :document_number, uniqueness: { scope: :document_type }, allow_nil: true
 
   validate :validate_username_length