diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index 932262a0..e6c84438 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -3518,7 +3518,7 @@ class File_X509
 
         $altName = array();
 
-        if (isset($subject->domains) && count($subject->domains) > 1) {
+        if (isset($subject->domains) && count($subject->domains)) {
             $altName = array_map(array('File_X509', '_dnsName'), $subject->domains);
         }