diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index e319118c..5bf7db82 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -2774,7 +2774,7 @@ class Net_SSH2 {
                 case NET_SSH2_LOG_REALTIME_FILE:
                     if (!isset($this->realtime_log_file)) {
                         // PHP doesn't seem to like using constants in fopen()
-                        $filename = NET_SSH2_LOG_REALTIME_FILE;
+                        $filename = NET_SSH2_LOG_REALTIME_FILENAME;
                         $fp = fopen($filename, 'w');
                         $this->realtime_log_file = $fp;
                     }