diff --git a/core/lib/Drupal/Core/Template/Attribute.php b/core/lib/Drupal/Core/Template/Attribute.php
index deeb549..f2cbc9a 100644
--- a/core/lib/Drupal/Core/Template/Attribute.php
+++ b/core/lib/Drupal/Core/Template/Attribute.php
@@ -172,9 +172,7 @@ public function addClass() {
    */
   public function setAttribute($attribute, $value) {
     // If attribute key exists we can set attribute.
-    if ($attribute) {
       $this->offsetSet($attribute, $value);
-    }
 
     return $this;
   }