diff --git a/core/modules/block/src/BlockRepository.php b/core/modules/block/src/BlockRepository.php
index fff1fb8..61d364e 100644
--- a/core/modules/block/src/BlockRepository.php
+++ b/core/modules/block/src/BlockRepository.php
@@ -47,22 +47,12 @@ public function __construct(EntityManagerInterface $entity_manager, ThemeManager
   }
 
   /**
-   * Returns the human-readable list of regions keyed by machine name.
-   *
-   * @return array
-   *   An array of human-readable region names keyed by machine name.
-   */
-  protected function getRegionNames() {
-    return system_region_list($this->getTheme());
-  }
-
-  /**
    * Returns the list of regions keyed by machine name.
    *
    * @return array
    *   An array of region machine names keyed by machine name.
    */
-  protected function getRegions() {
+  protected function getRegionNames() {
     return system_region_list($this->getTheme(), REGIONS_ALL, FALSE);
   }
 
@@ -81,7 +71,8 @@ protected function getTheme() {
    */
   public function getVisibleBlocksPerRegion(array $contexts) {
     // Build an array of the region names in the right order.
-    $empty = array_fill_keys($this->getRegions(), array());
+    $empty = array_fill_keys($this->getRegionNames(), array());
+
     $full = array();
     foreach ($this->blockStorage->loadByProperties(array('theme' => $this->getTheme())) as $block_id => $block) {
       /** @var \Drupal\block\BlockInterface $block */
diff --git a/core/modules/block/tests/src/Unit/BlockRepositoryTest.php b/core/modules/block/tests/src/Unit/BlockRepositoryTest.php
index f589e82..1cd639b 100644
--- a/core/modules/block/tests/src/Unit/BlockRepositoryTest.php
+++ b/core/modules/block/tests/src/Unit/BlockRepositoryTest.php
@@ -69,9 +69,9 @@ protected function setUp() {
     $this->blockRepository->expects($this->once())
       ->method('getRegionNames')
       ->willReturn([
-        'top' => 'Top',
-        'center' => 'Center',
-        'bottom' => 'Bottom',
+        'top' => 'top',
+        'center' => 'center',
+        'bottom' => 'bottom',
       ]);
   }