diff --git a/phpseclib/Net/SFTP/Stream.php b/phpseclib/Net/SFTP/Stream.php
index 08d726ca..d2c4425d 100644
--- a/phpseclib/Net/SFTP/Stream.php
+++ b/phpseclib/Net/SFTP/Stream.php
@@ -179,7 +179,7 @@ class Stream
 
         if ($host[0] == '$') {
             $host = substr($host, 1);
-            global $$host;
+            global ${$host};
             if (($$host instanceof SFTP) === false) {
                 return false;
             }