diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
index a4a37db..31adb75 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
@@ -122,7 +122,7 @@ function testNameValidation() {
 
     // Try to save an object with a name longer than 250 characters.
     $name = 'config_test.herman_melville.moby_dick_or_the_whale.harper_1851.now_small_fowls_flew_screaming_over_the_yet_yawning_gulf_a_sullen_white_surf_beat_against_its_steep_sides_then_all_collapsed_and_the_great_shroud_of_the_sea_rolled_on_as_it_rolled_five_thousand_years_ago';
-    $message = 'Expected ConfigNameException was thrown for a name longer than Config::MAX_NAME_LENGTH.'
+    $message = 'Expected ConfigNameException was thrown for a name longer than Config::MAX_NAME_LENGTH.';
     try {
       $config = config($name);
       $config->save();