diff --git a/src/send/api/echo.c b/src/send/api/echo.c
index b0b0fe7..8812005 100644
--- a/src/send/api/echo.c
+++ b/src/send/api/echo.c
@@ -1,5 +1,6 @@
 #include "icmp.h"
 #include "icmp_types.h"
+#include <arpa/inet.h>
 #include <stdint.h>
 
 int
@@ -11,8 +12,8 @@ icmp_send_echo(icmp_handle_t *h, struct in_addr dest, uint16_t id,
 		uint32_t raw;
 	} hdr_rest;
 
-	hdr_rest.echo.id = id;
-	hdr_rest.echo.seq = seq;
+	hdr_rest.echo.id = htons(id);
+	hdr_rest.echo.seq = htons(seq);
 	return icmp_send_raw(h, ICMP_TYPE_ECHO_REQUEST, 0, hdr_rest.raw,
 						NULL, 0, dest, ttl);
 }