diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/BackendCompilerPassTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/BackendCompilerPassTest.php
index ae304e0..2adef84 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/BackendCompilerPassTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/BackendCompilerPassTest.php
@@ -103,7 +103,8 @@ protected function getSqliteContainer($service) {
     $container = new ContainerBuilder();
     $container->setDefinition('service', $service);
     $container->setDefinition('sqlite.service', new Definition(__NAMESPACE__ . '\\ServiceClassSqlite'));
-    $container->set('database', new Connection(new \PDO('sqlite::memory:'), []));
+    $mock = $this->getMockBuilder('\Pdo')->disableOriginalConstructor()->getMock();
+    $container->set('database', new Connection($mock, []));
     return $container;
   }