diff --git a/protocol/dns/handle.go b/protocol/dns/handle.go
index 765e5051b..e13235099 100644
--- a/protocol/dns/handle.go
+++ b/protocol/dns/handle.go
@@ -46,7 +46,8 @@ func HandleStreamDNSRequest(ctx context.Context, router adapter.DNSRouter, conn
 			conn.Close()
 			return err
 		}
-		responseBuffer := buf.NewPacket()
+		responseLength := response.Len()
+		responseBuffer := buf.NewSize(3 + responseLength)
 		defer responseBuffer.Release()
 		responseBuffer.Resize(2, 0)
 		n, err := response.PackBuffer(responseBuffer.FreeBytes())