diff --git a/CHANGELOG b/CHANGELOG
index df86b9e..7dafe31 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,7 @@ proxy更新日志
 
 v6.1
 1.黑白名单支持设置顶级域了,比如:com,匹配所有的.com域名
+2.优化TCPS内存释放.
 
 v6.0 企业版开源啦
 本次更新主要是把企业版开源,把企业版代码合并到现在的开源goproxy当中,继续遵循GPLv3,免费开源,
diff --git a/utils/structs.go b/utils/structs.go
index 570a29d..55dbf72 100644
--- a/utils/structs.go
+++ b/utils/structs.go
@@ -177,7 +177,7 @@ func (c *Checker) domainIsInMap(address string, blockedMap bool) bool {
 	domainSlice := strings.Split(u.Hostname(), ".")
 	if len(domainSlice) > 1 {
 		subSlice := domainSlice[:len(domainSlice)-1]
-		topDomain := strings.Join(domainSlice[len(domainSlice)-1:], ".")
+		topDomain := domainSlice[len(domainSlice)-1:][0]
 		checkDomain := topDomain
 		if !blockedMap && c.directMap.Has(checkDomain) {
 			return true