diff --git a/configure.in b/configure.in
index 992663f87..8fdb25083 100644
--- a/configure.in
+++ b/configure.in
@@ -356,6 +356,8 @@ AC_CHECK_FUNCS([				\
 	_getpty					\
 	_scrsize				\
 	fcntl					\
+	getpeereid				\
+	getpeerucred				\
 	grantpt					\
 	mktime					\
 	ptsname					\