diff -u b/core/modules/user/tests/src/Functional/UserRegistrationTest.php b/core/modules/user/tests/src/Functional/UserRegistrationTest.php
--- b/core/modules/user/tests/src/Functional/UserRegistrationTest.php
+++ b/core/modules/user/tests/src/Functional/UserRegistrationTest.php
@@ -51,7 +51,7 @@
     $this->assertSession()->statusCodeEquals(200);
     $edit = [];
     $edit['name'] = $name = $this->randomMachineName();
-    $edit['mail'] = $mail = $edit['name'] . '@example.com';;
+    $edit['mail'] = $mail = $edit['name'] . '@example.com';
     $this->submitForm($edit, 'Create new account');
     $this->assertSession()->responseContains('A welcome message with further instructions has been sent to your email address.');