diff --git a/modules/salesforce_mapping/src/Plugin/Validation/Constraint/UniqueFieldsConstraintValidator.php b/modules/salesforce_mapping/src/Plugin/Validation/Constraint/UniqueFieldsConstraintValidator.php
index b900cac3337237145ac5a0bc7b061ef6da16456d..39652cbcb39a52a65d066a0b852cf7e500a14936 100644
--- a/modules/salesforce_mapping/src/Plugin/Validation/Constraint/UniqueFieldsConstraintValidator.php
+++ b/modules/salesforce_mapping/src/Plugin/Validation/Constraint/UniqueFieldsConstraintValidator.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\salesforce_mapping\Plugin\Validation\Constraint;
 
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\Validator\Constraint;
@@ -10,7 +11,7 @@ use Symfony\Component\Validator\ConstraintValidator;
 /**
  * Validates that a set of fields are unique for the given entity type.
  */
-class UniqueFieldsConstraintValidator extends ConstraintValidator {
+class UniqueFieldsConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {
 
   /**
    * The entity type manager.