diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index ea5fb083..10d98fba 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -454,7 +454,7 @@ class SFTP extends SSH2
             // yields inconsistent behavior depending on how php is compiled.  so we left shift -1 (which, in
             // two's compliment, consists of all 1 bits) by 31.  on 64-bit systems this'll yield 0xFFFFFFFF80000000.
             // that's not a problem, however, and 'anded' and a 32-bit number, as all the leading 1 bits are ignored.
-            (PHP_INT_SIZE == 4 ? -1 : 0xFFFFFFFF) => 'NET_SFTP_ATTR_EXTENDED'
+            (PHP_INT_SIZE == 4 ? (-1 << 31) : 0x80000000) => 'NET_SFTP_ATTR_EXTENDED'
         );
         $this->open_flags = array(
             0x00000001 => 'NET_SFTP_OPEN_READ',