diff --git a/system/core/Log.php b/system/core/Log.php
index ca3e38a7fe..a69d285ef8 100644
--- a/system/core/Log.php
+++ b/system/core/Log.php
@@ -218,6 +218,7 @@ public function write_log($level, $msg)
 
 		$message .= $this->_format_line($level, $date, $msg);
 
+		$result = FALSE;
 		for ($written = 0, $length = self::strlen($message); $written < $length; $written += $result)
 		{
 			if (($result = fwrite($fp, self::substr($message, $written))) === FALSE)