diff --git a/modules/system/tests/bootstrap/app.php b/modules/system/tests/bootstrap/app.php
index 11dd502e78..1063af2536 100644
--- a/modules/system/tests/bootstrap/app.php
+++ b/modules/system/tests/bootstrap/app.php
@@ -25,6 +25,15 @@
     $loader->autoloadPackage(basename($modulePath), $modulePath);
 }
 
+/*
+ * Manually register System aliases
+ */
+foreach (require(__DIR__ . '/../../aliases.php') as $alias => $class) {
+    if (!class_exists($alias)) {
+        class_alias($class, $alias);
+    }
+}
+
 /*
  * Manually register all plugin classes for autoloading
  */