diff --git a/app/models/person.rb b/app/models/person.rb
index 6c3c609..02bdf96 100644
--- a/app/models/person.rb
+++ b/app/models/person.rb
@@ -120,6 +120,12 @@ class Person < Profile
 
   validates_multiparameter_assignments
 
+  validates_each :birth_date do |record,attr,value|
+    if value && value.year == 1
+      record.errors.add(attr, _('%{fn} is invalid'))
+    end
+  end
+
   def self.fields
     FIELDS
   end
diff --git a/test/unit/person_test.rb b/test/unit/person_test.rb
index c8c4b84..3609fee 100644
--- a/test/unit/person_test.rb
+++ b/test/unit/person_test.rb
@@ -1193,6 +1193,12 @@ class PersonTest < ActiveSupport::TestCase
     end
   end
 
+  should 'not accept an empty year on birth date' do
+    p = Person.new({"birth_date(2i)"=>"11", "birth_date(3i)"=>"15", "birth_date(1i)"=>""})
+    p.valid?
+    assert p.errors.invalid?(:birth_date)
+  end
+
   should 'associate report with the correct complaint' do
     p1 = create_user('user1').person
     p2 = create_user('user2').person
--
libgit2 0.21.2