1 files changed, 1 insertions, 1 deletions

diff --git a/include/unistd.h b/include/unistd.h
index 1f1f8a7cebd4..5a4991ef9fe1 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -552,7 +552,7 @@ char	*re_comp(const char *);
 int	 re_exec(const char *);
 int	 reboot(int);
 int	 revoke(const char *);
-pid_t	 rfork(int);
+pid_t	 rfork(int) __returns_twice;
 pid_t	 rfork_thread(int, void *, int (*)(void *), void *);
 int	 rresvport(int *);
 int	 rresvport_af(int *, int);