diff --git a/core/modules/block/lib/Drupal/block/Tests/BlockHiddenRegionTest.php b/core/modules/block/lib/Drupal/block/Tests/BlockHiddenRegionTest.php
index 00abce4..208710e 100644
--- a/core/modules/block/lib/Drupal/block/Tests/BlockHiddenRegionTest.php
+++ b/core/modules/block/lib/Drupal/block/Tests/BlockHiddenRegionTest.php
@@ -69,7 +69,7 @@ public function testBlockNotInHiddenRegion() {
 
     // Ensure that "block_test_theme" is set as the default theme.
     $this->drupalGet('admin/structure/block');
-    $this->assertText('Block test _theme(' . t('active tab') . ')', 'Default local task on blocks admin page is the block test theme.');
+    $this->assertText('Block test theme(' . t('active tab') . ')', 'Default local task on blocks admin page is the block test theme.');
 
     // Ensure that the search form block is displayed.
     $this->drupalGet('');