--- a/networking/ping.c
+++ b/networking/ping.c
@@ -91,7 +91,7 @@
 	struct sockaddr_in pingaddr;
 	struct icmp *pkt;
 	int pingsock, c;
-	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
+	char packet[datalen + ICMP_MINLEN + MAXIPLEN + MAXICMPLEN];
 
 	pingsock = create_icmp_socket();
 	pingaddr = lsa->u.sin;
@@ -101,7 +101,7 @@
 	pkt->icmp_type = ICMP_ECHO;
 	pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
 
-	c = xsendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN,
+	c = xsendto(pingsock, packet, datalen + ICMP_MINLEN,
 			   (struct sockaddr *) &pingaddr, sizeof(pingaddr));
 
 	/* listen for replies */
@@ -135,7 +135,7 @@
 	struct icmp6_hdr *pkt;
 	int pingsock, c;
 	int sockopt;
-	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
+	char packet[datalen + ICMP_MINLEN + MAXIPLEN + MAXICMPLEN];
 
 	pingsock = create_icmp6_socket();
 	pingaddr = lsa->u.sin6;
@@ -147,7 +147,7 @@
 	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
 	setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
 
-	c = xsendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr),
+	c = xsendto(pingsock, packet, datalen + sizeof (struct icmp6_hdr),
 			   (struct sockaddr *) &pingaddr, sizeof(pingaddr));
 
 	/* listen for replies */
