diff --git a/src/Credentials/GCECredentials.php b/src/Credentials/GCECredentials.php
index 9453088a3..991589b52 100644
--- a/src/Credentials/GCECredentials.php
+++ b/src/Credentials/GCECredentials.php
@@ -184,8 +184,7 @@ public function __construct(
         $scope = null,
         $targetAudience = null,
         $quotaProject = null,
-        $serviceAccountIdentity = null,
-        string $universeDomain = null
+        $serviceAccountIdentity = null
     ) {
         $this->iam = $iam;
 
@@ -295,18 +294,6 @@ private static function getProjectIdUri()
         return $base . self::PROJECT_ID_URI_PATH;
     }
 
-    /**
-     * The full uri for accessing the default universe domain.
-     *
-     * @return string
-     */
-    private static function getUniverseDomainUri()
-    {
-        $base = 'http://' . self::METADATA_IP . '/computeMetadata/';
-
-        return $base . self::UNIVERSE_DOMAIN_URI_PATH;
-    }
-
     /**
      * Determines if this an App Engine Flexible instance, by accessing the
      * GAE_INSTANCE environment variable.