diff --git a/dns.c b/dns.c
index c1e874b..88c1220 100644
--- a/dns.c
+++ b/dns.c
@@ -183,13 +183,15 @@ dns_handle_tun(int fd, char *data, int len)
 void
 dns_ping(int dns_fd)
 {
+	char data[3];
 	if (dns_sending()) {
 		printf("No reply on chunk, discarding\n");
 		lastlen = 0;
 		packetpos = 0;
 		packetlen = 0;
 	}
-	dns_write(dns_fd, ++pingid, "", 0);
+	snprintf(data, 3, "%02X", pingid);
+	dns_write(dns_fd, ++pingid, data, 2);
 }
 
 void