diff --git a/core/modules/simpletest/src/WebTestBase.php b/core/modules/simpletest/src/WebTestBase.php
index c7040fb..d12b6cb 100644
--- a/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -640,12 +640,12 @@ protected function setUp() {
     // Preserve original batch for later restoration.
     $this->setBatch();
 
-    // Get parameters for install_drupal() before removing global variables.
-    $parameters = $this->installParameters();
-
     // Initialize user 1 and session name.
     $this->initUserSession();
 
+    // Get parameters for install_drupal() before removing global variables.
+    $parameters = $this->installParameters();
+
     // Prepare the child site settings.
     $this->prepareSettings();