diff --git a/src/Result/Result.php b/src/Result/Result.php
index 60bca66..b765867 100644
--- a/src/Result/Result.php
+++ b/src/Result/Result.php
@@ -3,6 +3,7 @@
 namespace Drupal\facets\Result;
 
 use Drupal\Core\Url;
+use Drupal\facets\FacetInterface;
 
 /**
  * The default implementation of the result interfaces.
@@ -70,7 +71,7 @@ class Result implements ResultInterface {
    * @param int|null $count
    *   The amount of items or NULL.
    */
-  public function __construct($facet, $raw_value, $display_value, $count) {
+  public function __construct(FacetInterface $facet, $raw_value, $display_value, $count) {
     $this->facet = $facet;
     $this->rawValue = $raw_value;
     $this->displayValue = $display_value;