diff --git a/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php b/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
index 33e484320a..95b0589fc9 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
@@ -167,6 +167,7 @@ class UniqueEntityValidatorTest extends AbstractConstraintValidatorTest
         $this->buildViolation('myMessage')
             ->atPath('property.path.name')
             ->setInvalidValue('Foo')
+            ->setCode(UniqueEntity::NOT_UNIQUE_ERROR)
             ->assertRaised();
     }
 
@@ -190,6 +191,7 @@ class UniqueEntityValidatorTest extends AbstractConstraintValidatorTest
         $this->buildViolation('myMessage')
             ->atPath('property.path.bar')
             ->setInvalidValue('Foo')
+            ->setCode(UniqueEntity::NOT_UNIQUE_ERROR)
             ->assertRaised();
     }
 
@@ -241,6 +243,7 @@ class UniqueEntityValidatorTest extends AbstractConstraintValidatorTest
         $this->buildViolation('myMessage')
             ->atPath('property.path.name')
             ->setInvalidValue('Foo')
+            ->setCode(UniqueEntity::NOT_UNIQUE_ERROR)
             ->assertRaised();
     }
 
@@ -272,6 +275,7 @@ class UniqueEntityValidatorTest extends AbstractConstraintValidatorTest
         $this->buildViolation('myMessage')
             ->atPath('property.path.name2')
             ->setInvalidValue('Bar')
+            ->setCode(UniqueEntity::NOT_UNIQUE_ERROR)
             ->assertRaised();
     }
 
@@ -404,6 +408,7 @@ class UniqueEntityValidatorTest extends AbstractConstraintValidatorTest
         $this->buildViolation('myMessage')
             ->atPath('property.path.single')
             ->setInvalidValue($entity1)
+            ->setCode(UniqueEntity::NOT_UNIQUE_ERROR)
             ->assertRaised();
     }
 
diff --git a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntity.php b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntity.php
index fc6e213bd7..315b1654e8 100644
--- a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntity.php
@@ -23,6 +23,8 @@ use Symfony\Component\Validator\Constraint;
  */
 class UniqueEntity extends Constraint
 {
+    const NOT_UNIQUE_ERROR = '23bd9dbf-6b9b-41cd-a99e-4844bcf3077f';
+
     public $message = 'This value is already used.';
     public $service = 'doctrine.orm.validator.unique';
     public $em = null;
@@ -31,6 +33,10 @@ class UniqueEntity extends Constraint
     public $errorPath = null;
     public $ignoreNull = true;
 
+    protected static $errorNames = array(
+        self::NOT_UNIQUE_ERROR => 'NOT_UNIQUE_ERROR',
+    );
+
     public function getRequiredOptions()
     {
         return array('fields');
diff --git a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
index f4c8671aba..94b40f980a 100644
--- a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
+++ b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
@@ -132,11 +132,13 @@ class UniqueEntityValidator extends ConstraintValidator
             $this->context->buildViolation($constraint->message)
                 ->atPath($errorPath)
                 ->setInvalidValue($invalidValue)
+                ->setCode(UniqueEntity::NOT_UNIQUE_ERROR)
                 ->addViolation();
         } else {
             $this->buildViolation($constraint->message)
                 ->atPath($errorPath)
                 ->setInvalidValue($invalidValue)
+                ->setCode(UniqueEntity::NOT_UNIQUE_ERROR)
                 ->addViolation();
         }
     }