diff --git a/core/modules/system/lib/Drupal/system/Tests/Cache/DatabaseBackendUnitTest.php b/core/modules/system/lib/Drupal/system/Tests/Cache/DatabaseBackendUnitTest.php
index f301257..18cc65e 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Cache/DatabaseBackendUnitTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Cache/DatabaseBackendUnitTest.php
@@ -36,6 +36,9 @@ protected function createCacheBackend($bin) {
    * Installs system schema.
    */
   public function setUpCacheBackend() {
+    // Calling drupal_install_schema() entails a call to module_invoke, for which
+    // we need a ModuleHandler. Register one to the container.
+    $this->container->register('module_handler', 'Drupal\Core\ModuleHandler');
     drupal_install_schema('system');
   }