diff --git a/sql/Mysql.sql b/sql/Mysql.sql
index bb0c984..4abc081 100644
--- a/sql/Mysql.sql
+++ b/sql/Mysql.sql
@@ -1,6 +1,6 @@
 CREATE TABLE `typecho_access_log` (
   `id`                int(10) unsigned NOT NULL auto_increment,
-  `ua`                varchar(255)     default ''  ,
+  `ua`                varchar(512)     default ''  ,
   `browser_id`        varchar(32)      default ''  ,
   `browser_version`   varchar(32)      default ''  ,
   `os_id`             varchar(32)      default ''  ,
diff --git a/sql/SQLite.sql b/sql/SQLite.sql
index 4b9c001..6dfaadb 100644
--- a/sql/SQLite.sql
+++ b/sql/SQLite.sql
@@ -1,6 +1,6 @@
 CREATE TABLE `typecho_access_log` (
   `id`                INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
-  `ua`                varchar(255)     default ''  ,
+  `ua`                varchar(512)     default ''  ,
   `browser_id`        varchar(32)      default ''  ,
   `browser_version`   varchar(32)      default ''  ,
   `os_id`             varchar(32)      default ''  ,