diff --git a/appl/telnet/configure.in b/appl/telnet/configure.in
index dc1a63692..3a77c937e 100644
--- a/appl/telnet/configure.in
+++ b/appl/telnet/configure.in
@@ -211,7 +211,7 @@ AC_SUBST(OLD_ENVIRON)
 
 AC_REPLACE_FUNCS(getent herror memmove setenv strdup strerror)
 
-AC_CHECK_FUNCS(cgetent uname vfork vhangup frevoke revoke setsid)
+AC_CHECK_FUNCS(cgetent uname vfork vhangup frevoke revoke setsid setpgid)
 
 AC_CHECK_FUNCS(tgetent setupterm)