diff --git a/lib/phpmailer/class.smtp.php b/lib/phpmailer/class.smtp.php
index d8bfd6f136..1d2aa89c82 100644
--- a/lib/phpmailer/class.smtp.php
+++ b/lib/phpmailer/class.smtp.php
@@ -617,7 +617,7 @@ class SMTP {
 
     protected function parseHelloFields($type)
     {
-        $this->server_caps = [];
+        $this->server_caps = array();
         $lines = explode("\n", $this->helo_rply);
 
         foreach ($lines as $n => $s) {
@@ -639,7 +639,7 @@ class SMTP {
                         break;
                     case 'AUTH':
                         if (!is_array($fields)) {
-                            $fields = [];
+                            $fields = array();
                         }
                         break;
                     default: