diff --git a/appl/telnet/telnet/network.c b/appl/telnet/telnet/network.c
index 7efbd77b9..e36cfd41c 100644
--- a/appl/telnet/telnet/network.c
+++ b/appl/telnet/telnet/network.c
@@ -87,7 +87,7 @@ stilloob()
     do {
 	FD_ZERO(&excepts);
 	FD_SET(net, &excepts);
-	value = select(net+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
+	value = select(net+1, 0, 0, &excepts, &timeout);
     } while ((value == -1) && (errno == EINTR));
 
     if (value < 0) {
diff --git a/appl/telnet/telnet/utilities.c b/appl/telnet/telnet/utilities.c
index bed5f35e9..9da39df5c 100644
--- a/appl/telnet/telnet/utilities.c
+++ b/appl/telnet/telnet/utilities.c
@@ -859,20 +859,20 @@ printsub(direction, pointer, length)
     void
 EmptyTerminal()
 {
-    fd_set	o;
+    fd_set	outs;
 
-    FD_ZERO(&o);
+    FD_ZERO(&outs);
 
     if (TTYBYTES() == 0) {
-	FD_SET(tout, &o);
-	(void) select(tout+1, (fd_set *) 0, &o, (fd_set *) 0,
-			(struct timeval *) 0);	/* wait for TTLOWAT */
+	FD_SET(tout, &outs);
+	(void) select(tout+1, 0, &outs, 0,
+		      (struct timeval *) 0); /* wait for TTLOWAT */
     } else {
 	while (TTYBYTES()) {
 	    (void) ttyflush(0);
-	    FD_SET(tout, &o);
-	    (void) select(tout+1, (fd_set *) 0, &o, (fd_set *) 0,
-				(struct timeval *) 0);	/* wait for TTLOWAT */
+	    FD_SET(tout, &outs);
+	    (void) select(tout+1, 0, &outs, 0,
+			  (struct timeval *) 0); /* wait for TTLOWAT */
 	}
     }
 }
diff --git a/appl/telnet/telnetd/utility.c b/appl/telnet/telnetd/utility.c
index d4bd68324..9a99ae2d9 100644
--- a/appl/telnet/telnetd/utility.c
+++ b/appl/telnet/telnetd/utility.c
@@ -97,7 +97,7 @@ stilloob(int s)
     do {
 	FD_ZERO(&excepts);
 	FD_SET(s, &excepts);
-	value = select(s+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
+	value = select(s+1, 0, 0, &excepts, &timeout);
     } while ((value == -1) && (errno == EINTR));
 
     if (value < 0) {