diff --git a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
index 56f6521..7f0f44f 100644
--- a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
+++ b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
@@ -7,6 +7,7 @@
 use Drupal\Core\Field\WidgetBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\link\LinkItemInterface;
+use Drupal\Tests\link\Functional\LinkFieldTest;
 use Symfony\Component\Validator\ConstraintViolation;
 use Symfony\Component\Validator\ConstraintViolationListInterface;
 
@@ -100,6 +101,7 @@ protected static function getUriAsDisplayableString($uri) {
    * @see static::getUriAsDisplayableString()
    */
   protected static function getUserEnteredStringAsUri($string) {
+    $string = trim($string);
     // By default, assume the entered string is an URI.
     $uri = $string;