diff --git a/mailstream/phpmailer/class.phpmailer.php b/mailstream/phpmailer/class.phpmailer.php
index 8cd05a2c..baf6c5ba 100644
--- a/mailstream/phpmailer/class.phpmailer.php
+++ b/mailstream/phpmailer/class.phpmailer.php
@@ -3874,8 +3874,8 @@ class PHPMailer
                 $date_header = $header;
                 $current = 'date_header';
             } else {
-                if (!empty($$current) && strpos($header, ' =?') === 0) {
-                    $$current .= $header;
+                if (!empty($current) && strpos($header, ' =?') === 0) {
+                    $current .= $header;
                 } else {
                     $current = '';
                 }