diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 4fe89b4b..2471bf3e 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -3227,9 +3227,11 @@ class SSH2
         }
 
         $start = microtime(true);
-        $sec = (int) floor($this->curTimeout);
-        $usec = (int) (1000000 * ($this->curTimeout - $sec));
-        stream_set_timeout($this->fsock, $sec, $usec);
+        if ($this->curTimeout) {
+            $sec = (int) floor($this->curTimeout);
+            $usec = (int) (1000000 * ($this->curTimeout - $sec));
+            stream_set_timeout($this->fsock, $sec, $usec);
+        }
         $raw = stream_get_contents($this->fsock, $this->decrypt_block_size);
 
         if (!strlen($raw)) {