diff --git a/rules/common/uid.go b/rules/common/uid.go
index d5321581..f7ea4875 100644
--- a/rules/common/uid.go
+++ b/rules/common/uid.go
@@ -72,14 +72,14 @@ func (u *Uid) RuleType() C.RuleType {
 }
 
 func (u *Uid) Match(metadata *C.Metadata) bool {
-	srcPort, err := strconv.Atoi(metadata.SrcPort)
+	srcPort, err := strconv.ParseUint(metadata.SrcPort, 10, 16)
 	if err != nil {
 		return false
 	}
 	var uid int32
 	if metadata.Uid != nil {
 		uid = *metadata.Uid
-	} else if uid, err = process.FindUid(metadata.NetWork.String(), metadata.SrcIP, srcPort); err == nil {
+	} else if uid, err = process.FindUid(metadata.NetWork.String(), metadata.SrcIP, int(srcPort)); err == nil {
 		metadata.Uid = &uid
 	} else {
 		log.Warnln("[UID] could not get uid from %s", metadata.String())
diff --git a/tunnel/tunnel.go b/tunnel/tunnel.go
index 936b2b48..b8038520 100644
--- a/tunnel/tunnel.go
+++ b/tunnel/tunnel.go
@@ -181,9 +181,9 @@ func preHandleMetadata(metadata *C.Metadata) error {
 	}
 
 	// pre resolve process name
-	srcPort, err := strconv.Atoi(metadata.SrcPort)
+	srcPort, err := strconv.ParseUint(metadata.SrcPort, 10, 16)
 	if err == nil && P.ShouldFindProcess(metadata) {
-		uid, path, err := P.FindProcessName(metadata.NetWork.String(), metadata.SrcIP, srcPort)
+		uid, path, err := P.FindProcessName(metadata.NetWork.String(), metadata.SrcIP, int(srcPort))
 		if err != nil {
 			if failTotal < 20 {
 				log.Debugln("[Process] find process %s: %v", metadata.String(), err)