diff --git a/phpseclib/File/ASN1.php b/phpseclib/File/ASN1.php
index 6386fd3fe..0fa8b1d65 100644
--- a/phpseclib/File/ASN1.php
+++ b/phpseclib/File/ASN1.php
@@ -1458,11 +1458,12 @@ public static function extractBER($str)
          * subject=/O=organization/OU=org unit/CN=common name
          * issuer=/O=organization/CN=common name
          */
+      
         $temp = strlen($str) <= ini_get('pcre.backtrack_limit') ?
             preg_replace('#.*?^-+[^-]+-+[\r\n ]*$#ms', '', $str, 1) :
             $str;
         // remove the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- stuff
-        $temp = preg_replace('#-+[^-]+-+#', '', $temp);
+        $temp = preg_replace('#-+[^-]+-+#', '', $str);
         // remove new lines
         $temp = str_replace(["\r", "\n", ' '], '', $temp);
         $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? Base64::decode($temp) : false;