diff --git a/src/Object/Product/Product.php b/src/Object/Product/Product.php
index 8514f750..c00bbff4 100644
--- a/src/Object/Product/Product.php
+++ b/src/Object/Product/Product.php
@@ -672,7 +672,7 @@ public function setRatingValue($ratingValue)
      */
     public function getAlternateImageUrls()
     {
-        return array_diff($this->alternateImageUrls, array($this->getImageUrl()));
+        return array_values(array_diff($this->alternateImageUrls, array($this->getImageUrl())));
     }
 
     /**