diff --git a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
index 2dc8ed6..223dbe7 100644
--- a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
+++ b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
@@ -100,6 +100,7 @@ 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;