diff --git a/lib/db/legacyclasses.php b/lib/db/legacyclasses.php
index ea85c4f63e2..75076d95c32 100644
--- a/lib/db/legacyclasses.php
+++ b/lib/db/legacyclasses.php
@@ -30,7 +30,7 @@ defined('MOODLE_INTERNAL') || die();
 // The old class name is the key, the path to the file containing the class is the vlaue.
 // The array must be called $legacyclasses.
 $legacyclasses = [
-    \bootstrap_renderer::class => 'output\bootstrap_renderer',
+    \bootstrap_renderer::class => 'output/bootstrap_renderer.php',
     \coding_exception::class => 'exception/coding_exception.php',
     \file_serving_exception::class => 'exception/file_serving_exception.php',
     \invalid_dataroot_permissions::class => 'exception/invalid_dataroot_permissions.php',