diff --git a/tests/system/Helpers/URLHelper/MiscUrlTest.php b/tests/system/Helpers/URLHelper/MiscUrlTest.php
index 85466b151a2e..4767dbf0cbfd 100644
--- a/tests/system/Helpers/URLHelper/MiscUrlTest.php
+++ b/tests/system/Helpers/URLHelper/MiscUrlTest.php
@@ -949,7 +949,7 @@ public function testUrlToWithRouteWithNestedParentheses(): void
     public function testUrlToMissingArgument(): void
     {
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage('Missing argument for "([a-zA-Z]+)" in route "([a-zA-Z]+)/login".');
+        $this->expectExceptionMessage('Missing argument for "(:alpha)" in route "(:alpha)/login".');
 
         $routes = Services::routes();
         $routes->group('(:alpha)', static function ($routes): void {