Index: sbin/ping6/ping6.c
===================================================================
--- sbin/ping6/ping6.c
+++ sbin/ping6/ping6.c
@@ -1379,8 +1379,12 @@
 			struct tv32 *tv32;
 			(void)gettimeofday(&tv, NULL);
 			tv32 = (struct tv32 *)&outpack[ICMP6ECHOLEN];
-			tv32->tv32_sec = htonl(tv.tv_sec);
-			tv32->tv32_usec = htonl(tv.tv_usec);
+			/*
+			 * The time values saved in a packet are
+			 * truncated down to 32 bits.
+			 */
+			tv32->tv32_sec = (uint32_t)htonl(tv.tv_sec);
+			tv32->tv32_usec = (uint32_t)htonl(tv.tv_usec);
 		}
 		cc = ICMP6ECHOLEN + datalen;
 	}