diff --git a/src/include/gpxe/dns.h b/src/include/gpxe/dns.h
index f2249da2..3e3cff1b 100644
--- a/src/include/gpxe/dns.h
+++ b/src/include/gpxe/dns.h
@@ -87,6 +87,4 @@ union dns_rr_info {
 	struct dns_rr_info_cname cname;
 };
 
-extern struct sockaddr_tcpip nameserver;
-
 #endif /* _GPXE_DNS_H */
diff --git a/src/net/udp/dns.c b/src/net/udp/dns.c
index 2dac8ee9..b141eea4 100644
--- a/src/net/udp/dns.c
+++ b/src/net/udp/dns.c
@@ -40,7 +40,7 @@
  */
 
 /** The DNS server */
-struct sockaddr_tcpip nameserver = {
+static struct sockaddr_tcpip nameserver = {
 	.st_port = htons ( DNS_PORT ),
 };