diff --git a/tests/src/Kernel/RegionViewBuilderTest.php b/tests/src/Kernel/RegionViewBuilderTest.php
index 40a1eb8..e49316f 100644
--- a/tests/src/Kernel/RegionViewBuilderTest.php
+++ b/tests/src/Kernel/RegionViewBuilderTest.php
@@ -62,14 +62,14 @@ final class RegionViewBuilderTest extends AbstractTestCase {
 
     $build = $view_builder->build('sidebar_first');
     // The build should be empty because 'stark' is not a default theme.
-    $expected_build = [
+    $expected_sidebar_first = [
       '#cache' => [
         'contexts' => [],
         'tags' => ['config:block_list'],
         'max-age' => Cache::PERMANENT,
       ],
     ];
-    self::assertSame($expected_build, $build);
+    self::assertSame($expected_sidebar_first, $build);
 
     // Specify the theme name explicitly.
     $build = $view_builder->build('sidebar_first', 'stark');
@@ -137,7 +137,7 @@ final class RegionViewBuilderTest extends AbstractTestCase {
       ->save();
 
     $build = $view_builder->build('sidebar_first');
-    self::assertRenderArray($expected_build, $build);
+    self::assertRenderArray($expected_sidebar_first, $build);
 
     Html::resetSeenIds();
     $actual_html = $renderer->renderPlain($expected_build);