diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index fcc55f35..c080baa0 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -3197,7 +3197,7 @@ class SSH2
             $read = [$this->fsock];
             $write = $except = null;
 
-            if ($this->curTimeout <= 0) {
+            if (!$this->curTimeout) {
                 if ($this->keepAlive <= 0) {
                     @stream_select($read, $write, $except, null);
                 } else {