diff --git a/src/CustomElementNormalizer.php b/src/CustomElementNormalizer.php
index faa85169146ce421bee02aa63508df5f88e8afc2..ee0ca98b95b56cbe3c7b716c07e0a205c36151c9 100644
--- a/src/CustomElementNormalizer.php
+++ b/src/CustomElementNormalizer.php
@@ -56,12 +56,6 @@ class CustomElementNormalizer implements NormalizerInterface {
       unset($result['element']);
     }
 
-    // Support Vue.js "is" attribute for defining element names.
-    if (!empty($result['is'])) {
-      $result['element'] = $result['is'];
-      unset($result['is']);
-    }
-
     // Collect cache metadata. Since the cache metadata object is passed down
     // to slots, custom elements of slots will add their metadata as well.
     $cache_metadata->addCacheableDependency($element);