diff --git a/src/Controller/SpiController.php b/src/Controller/SpiController.php
index 990cdb8..f163f65 100644
--- a/src/Controller/SpiController.php
+++ b/src/Controller/SpiController.php
@@ -774,7 +774,7 @@ class SpiController extends ControllerBase {
     $ver = [];
 
     $ver['base_version'] = \Drupal::VERSION;
-    $install_root = $server['DOCUMENT_ROOT'] . base_path();
+    $install_root = DRUPAL_ROOT;
     $ver['distribution'] = '';
 
     // Determine if this puppy is Acquia Drupal.