diff --git a/configure.in b/configure.in
index 8bf713153..765331962 100644
--- a/configure.in
+++ b/configure.in
@@ -169,6 +169,8 @@ AC_FIND_FUNC(syslog, syslog)
 
 AC_FIND_FUNC(logwtmp, util)
 AC_FIND_FUNC_NO_LIBS(tgetent, termcap)
+AC_FIND_FUNC(inet_ntop, ip6)
+AC_CHECK_FUNCS(inet_pton)
 
 dnl Checks for library functions.
 
@@ -176,7 +178,7 @@ AC_BROKEN_SNPRINTF
 AC_BROKEN_VSNPRINTF
 
 AC_CHECK_FUNCS(_getpty asnprintf asprintf fcntl gethostname gethostbyname2)
-AC_CHECK_FUNCS(getmsg grantpt inet_ntop logwtmp mktime ptsname rand random)
+AC_CHECK_FUNCS(getmsg grantpt logwtmp mktime ptsname rand random)
 AC_CHECK_FUNCS(revoke select setitimer setlogin setpcred setpgid)
 AC_CHECK_FUNCS(setsid setsockopt sigaction strstr timegm ttyname umask)
 AC_CHECK_FUNCS(unlockpt vasnprintf vasprintf vhangup)