diff --git a/dao/file.go b/dao/file.go
index 06ffc79..058a832 100644
--- a/dao/file.go
+++ b/dao/file.go
@@ -5,7 +5,7 @@ import "gorm.io/gorm"
 type File struct {
 	gorm.Model
 	// 存储文件名
-	FileStoreName string `gorm:"column:file_store_name;uniqueIndex:idx_file_name"`
+	FileStoreName string `gorm:"column:file_store_name;type:varchar(255);uniqueIndex:idx_file_name"`
 	NeedAuth      bool   `gorm:"column:need_auth"`
 	FileName      string `gorm:"column:file_name"`
 	FileSize      int    `gorm:"column:file_size"`