diff --git a/library/think/log/driver/File.php b/library/think/log/driver/File.php
index 98f117af..37d2ca8d 100644
--- a/library/think/log/driver/File.php
+++ b/library/think/log/driver/File.php
@@ -20,10 +20,10 @@ class File
 {
     protected $config = [
         'time_format' => ' c ',
+        'single'      => false,
         'file_size'   => 2097152,
         'path'        => LOG_PATH,
         'apart_level' => [],
-        'single'      => false,
     ];
 
     protected $writed = [];
@@ -84,7 +84,7 @@ class File
     protected function write($message, $destination, $apart = false)
     {
         //检测日志文件大小，超过配置大小则备份日志文件重新生成
-        if (!$this->config['single'] && is_file($destination) && floor($this->config['file_size']) <= filesize($destination)) {
+        if (is_file($destination) && floor($this->config['file_size']) <= filesize($destination)) {
             rename($destination, dirname($destination) . DS . time() . '-' . basename($destination));
             $this->writed[$destination] = false;
         }