diff --git a/src/ether_common.c b/src/ether_common.c
index 925f46c..f85b9ee 100644
--- a/src/ether_common.c
+++ b/src/ether_common.c
@@ -43,7 +43,7 @@ int     ETHEREventCount = 0;
 /*                                                                      */
 /************************************************************************/
 
-void init_ifpage_ether() {
+void init_ifpage_ether(void) {
   InterfacePage->nshost0 = (DLword)((ether_host[0] << 8) + ether_host[1]);
   InterfacePage->nshost1 = (DLword)((ether_host[2] << 8) + ether_host[3]);
   InterfacePage->nshost2 = (DLword)((ether_host[4] << 8) + ether_host[5]);
@@ -196,7 +196,7 @@ LispPTR ether_setfilter(LispPTR args[])
  *      check_ether() 175/77/0
  *      checks an incoming packet
  **********************************************************************/
-LispPTR check_ether()
+LispPTR check_ether(void)
 {
   return (NIL);
 }
diff --git a/src/ether_nethub.c b/src/ether_nethub.c
index 63ca502..7e5c883 100644
--- a/src/ether_nethub.c
+++ b/src/ether_nethub.c
@@ -188,7 +188,7 @@ void connectToHub(void) {
   log_all(("connectToHub() - connected to nethub\n"));
 }
 
-static void disconnectFromHub() {
+static void disconnectFromHub(void) {
   if (ether_fd > -1) {
     close(ether_fd);
     ether_fd = -1;
@@ -212,7 +212,7 @@ static void disconnectFromHub() {
  *    >0: number of bytes received and placed in ether_buf
  */
 
-static int recvPacket() {
+static int recvPacket(void) {
   int rcvLen;
   unsigned short bLen;
 
@@ -539,7 +539,7 @@ LispPTR ether_setfilter(LispPTR args[])
  *	check_ether() 175/77/0
  *	checks an incoming packet
  **********************************************************************/
-LispPTR check_ether()
+LispPTR check_ether(void)
 {
   int receivedBytes;
   struct pollfd pfds[1];
diff --git a/src/ether_sunos.c b/src/ether_sunos.c
index a125b77..729f2c8 100644
--- a/src/ether_sunos.c
+++ b/src/ether_sunos.c
@@ -474,7 +474,7 @@ LispPTR ether_setfilter(LispPTR args[])
 
 int estat[3];
 
-int *ether_debug() {
+int *ether_debug(void) {
 #ifdef MAIKO_ENABLE_ETHERNET
   estat[0] = 0;
   if (ether_fd < 0) return (NIL);
@@ -500,7 +500,7 @@ static int nitpos = 0, nitlen = 0; /* for NIT read buffer in OS3 */
 #endif
 #endif
 
-LispPTR check_ether() {
+LispPTR check_ether(void) {
 /*
  *	If receiver active then check if any packets are
  *	available from the ethernet.  If so, read the packet
@@ -615,7 +615,7 @@ LispPTR check_ether() {
 /*									*/
 /************************************************************************/
 
-LispPTR get_packet() {
+LispPTR get_packet(void) {
 #ifdef MAIKO_ENABLE_ETHERNET
 #ifndef PKTFILTER
   fd_set rfds;
@@ -739,7 +739,7 @@ static int check_filter(u_char *buffer)
  *	init_uid()
  *	sets effective user-id to real user-id
  **********************************************************************/
-static void init_uid() {
+static void init_uid(void) {
   int rid;
   rid = getuid();
   setuid(rid);
@@ -758,7 +758,7 @@ struct sockaddr_nit snit;
 /*	open nit socket, called from main before starting BCE.		*/
 /*      								*/
 /************************************************************************/
-void init_ether() {
+void init_ether(void) {
 #ifdef MAIKO_ENABLE_ETHERNET
 
   /* JRB - This code will have to be a bit different for SUN 4.0; the			probable