diff --git a/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php b/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php
index c14964c..1e9bb43 100644
--- a/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php
@@ -31,6 +31,7 @@ protected function setUp() {
     $cache_backend = $this->prophesize(CacheBackendInterface::class);
     $module_handler = $this->prophesize(ModuleHandlerInterface::class);
     $this->blockManager = new BlockManager(new \ArrayObject(), $cache_backend->reveal(), $module_handler->reveal());
+    $this->blockManager->setStringTranslation($this->getStringTranslationStub());
 
     $discovery = $this->prophesize(DiscoveryInterface::class);
     // Specify the 'broken' block, as well as 3 other blocks with admin labels