diff --git a/appl/telnet/telnet/commands.c b/appl/telnet/telnet/commands.c
index ca1138d7d..980abcd5c 100644
--- a/appl/telnet/telnet/commands.c
+++ b/appl/telnet/telnet/commands.c
@@ -1318,9 +1318,9 @@ shell(int argc, char **argv)
 	    else
 		shellname++;
 	    if (argc > 1)
-		execl(shellp, shellname, "-c", &saveline[1], 0);
+		execl(shellp, shellname, "-c", &saveline[1], NULL);
 	    else
-		execl(shellp, shellname, 0);
+		execl(shellp, shellname, NULL);
 	    perror("Execl");
 	    _exit(1);
 	}