diff --git a/app/models/member.rb b/app/models/member.rb
index f54981867..15f2b6c9a 100644
--- a/app/models/member.rb
+++ b/app/models/member.rb
@@ -84,7 +84,7 @@ class Member < ActiveRecord::Base
   protected
 
   def validate_role
-    errors.add_on_empty :role if member_roles.empty? && roles.empty?
+    errors.add_on_empty :roles if member_roles.empty? && roles.empty?
   end
 
   private
diff --git a/test/unit/member_test.rb b/test/unit/member_test.rb
index d8267158e..13a00c724 100644
--- a/test/unit/member_test.rb
+++ b/test/unit/member_test.rb
@@ -74,6 +74,7 @@ class MemberTest < ActiveSupport::TestCase
     assert user.save
     member = Member.new(:project_id => 1, :user_id => user.id, :role_ids => [])
     assert !member.save
+    assert_equal I18n.translate('activerecord.errors.messages.empty'), member.errors[:roles].to_s
   end
 
   def test_validate_member_role