diff --git a/tunnel/tunnel.go b/tunnel/tunnel.go
index 41fb0b16..316e3f4c 100644
--- a/tunnel/tunnel.go
+++ b/tunnel/tunnel.go
@@ -122,6 +122,11 @@ func preHandleMetadata(metadata *C.Metadata) error {
 	if ip := net.ParseIP(metadata.Host); ip != nil {
 		metadata.DstIP = ip
 		metadata.Host = ""
+		if ip.To4() != nil {
+			metadata.AddrType = C.AtypIPv4
+		} else {
+			metadata.AddrType = C.AtypIPv6
+		}
 	}
 
 	// preprocess enhanced-mode metadata