diff --git a/configure.in b/configure.in
index 8b5f5146a..44f5bb6d0 100644
--- a/configure.in
+++ b/configure.in
@@ -178,7 +178,7 @@ AC_BROKEN_VSNPRINTF
 AC_CHECK_FUNCS(_getpty asnprintf asprintf fcntl gethostname)
 AC_CHECK_FUNCS(getmsg grantpt logwtmp mktime ptsname rand random)
 AC_CHECK_FUNCS(revoke select setitimer setlogin setpcred setpgid)
-AC_CHECK_FUNCS(setsid setsockopt strstr timegm ttyname umask)
+AC_CHECK_FUNCS(setsid setsockopt sigaction strstr timegm ttyname umask)
 AC_CHECK_FUNCS(unlockpt vasnprintf vasprintf vhangup)
 
 AC_TYPE_SIGNAL