diff --git a/telnet/commands.c b/telnet/commands.c
index 3221699..32aca9f 100644
--- a/telnet/commands.c
+++ b/telnet/commands.c
@@ -532,11 +532,11 @@ togdebug(void)
 {
 #ifndef	NOT43
     if (net > 0 &&
-	(SetSockOpt(net, SOL_SOCKET, SO_DEBUG, debug)) < 0) {
+	(SetSockOpt(net, SOL_SOCKET, SO_DEBUG, telnet_debug)) < 0) {
 	    perror("setsockopt (SO_DEBUG)");
     }
 #else	/* NOT43 */
-    if (debug) {
+    if (telnet_debug) {
 	if (net > 0 && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0)
 	    perror("setsockopt (SO_DEBUG)");
     } else
@@ -741,7 +741,7 @@ static struct togglelist Togglelist[] = {
     { "debug",
 	"debugging",
 	    (int (*)(int))togdebug,
-		&debug,
+		&telnet_debug,
 		    "turn on socket level debugging" },
     { "netdata",
 	"printing of hexadecimal network data (debugging)",
@@ -2404,7 +2404,7 @@ tn(int argc, char *argv[])
 	}
 #endif	/* defined(IPPROTO_IP) && defined(IP_TOS) */
 
-	if (debug && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0) {
+	if (telnet_debug && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0) {
 		perror("setsockopt (SO_DEBUG)");
 	}
 
diff --git a/telnet/externs.h b/telnet/externs.h
index 5ecf114..e9be27e 100644
--- a/telnet/externs.h
+++ b/telnet/externs.h
@@ -127,7 +127,7 @@ extern int
     netdata,		/* Print out network data flow */
     prettydump,		/* Print "netdata" output in user readable format */
     termdata,		/* Print out terminal data flow */
-    debug,		/* Debug level */
+    telnet_debug,	/* Debug level */
     doaddrlookup,	/* do a reverse lookup? */
     clienteof;		/* Client received EOF */
 
diff --git a/telnet/main.c b/telnet/main.c
index de7e60c..e3fe643 100644
--- a/telnet/main.c
+++ b/telnet/main.c
@@ -213,7 +213,7 @@ main(int argc, char *argv[])
 			skiprc = 1;
 			break;
 		case 'd':
-			debug = 1;
+			telnet_debug = 1;
 			break;
 		case 'e':
 			set_escape_char(optarg);
diff --git a/telnet/telnet.c b/telnet/telnet.c
index 2e29989..82ee464 100644
--- a/telnet/telnet.c
+++ b/telnet/telnet.c
@@ -95,7 +95,7 @@ int
 	connected,
 	showoptions,
 	ISend,		/* trying to send network data in */
-	debug = 0,
+	telnet_debug = 0,
 	crmod,
 	netdata,	/* Print out network data flow */
 	crlf,		/* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
diff --git a/telnetd/telnetd.c b/telnetd/telnetd.c
index 6a5a623..bdb76d7 100644
--- a/telnetd/telnetd.c
+++ b/telnetd/telnetd.c
@@ -78,7 +78,7 @@ int terminaltypeok(char *);
 
 int	hostinfo = 1;			/* do we print login banner? */
 
-int debug = 0;
+static int debug = 0;
 int keepalive = 1;
 const char *altlogin;