diff --git a/library/think/db/Driver.php b/library/think/db/Driver.php
index aaddc795..847fe9ec 100644
--- a/library/think/db/Driver.php
+++ b/library/think/db/Driver.php
@@ -15,9 +15,9 @@ use PDO;
 use think\Config;
 use think\Db;
 use think\Debug;
+use think\exception\DbBindParamException;
 use think\exception\DbException;
 use think\exception\PDOException;
-use think\exception\DbBindParamException;
 use think\Log;
 
 abstract class Driver
@@ -266,7 +266,7 @@ abstract class Driver
                 // 判断占位符
                 $sql = is_numeric($key) ?
                 substr_replace($sql, $val, strpos($sql, '?'), 1) :
-                str_replace(':' . $key . ' ', $val . ' ', $sql);
+                str_replace(':' . $key . ' ', $val . ' ', $sql . ' ');
             }
         }
         return $sql;