diff --git a/configure.in b/configure.in
index 85aad4a1a..528f6278f 100644
--- a/configure.in
+++ b/configure.in
@@ -405,6 +405,7 @@ dnl Checks for library functions.
 AC_CHECK_FUNCS([				\
 	_getpty					\
 	_scrsize				\
+	arc4random				\
 	fcntl					\
 	getpeereid				\
 	getpeerucred				\