diff --git a/lib/ApiRequestor.php b/lib/ApiRequestor.php
index 80e28f077..022d9c599 100644
--- a/lib/ApiRequestor.php
+++ b/lib/ApiRequestor.php
@@ -260,7 +260,8 @@ private static function _defaultHeaders($apiKey, $clientInfo = null)
         $uaString = 'Stripe/v1 PhpBindings/' . Stripe::VERSION;
 
         $langVersion = phpversion();
-        $uname = php_uname();
+        $uname_disabled = in_array('php_uname', explode(',', ini_get('disable_functions')));
+        $uname = $uname_disabled ? '(disabled)' : php_uname();
 
         $appInfo = Stripe::getAppInfo();
         $ua = [