diff --git a/include/unistd.h b/include/unistd.h
index a0e30229b08c..b7686858cf55 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -405,7 +405,7 @@ int	 getlogin_r(char *, int);
 /* 1003.1-2001 */
 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
 int	 fchown(int, uid_t, gid_t);
-ssize_t	 readlink(const char *, char *, size_t);
+ssize_t	 readlink(const char * __restrict, char * __restrict, size_t);
 #endif
 #if __POSIX_VISIBLE >= 200112
 int	 gethostname(char *, size_t);
diff --git a/lib/libc/sys/readlink.2 b/lib/libc/sys/readlink.2
index e747e5755e9a..1c2593ae0642 100644
--- a/lib/libc/sys/readlink.2
+++ b/lib/libc/sys/readlink.2
@@ -28,7 +28,7 @@
 .\"     @(#)readlink.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd February 12, 2008
+.Dd February 26, 2008
 .Dt READLINK 2
 .Os
 .Sh NAME
@@ -39,7 +39,7 @@
 .Sh SYNOPSIS
 .In unistd.h
 .Ft ssize_t
-.Fn readlink "const char *path" "char *buf" "size_t bufsiz"
+.Fn readlink "const char *restrict path" "char *restrict buf" "size_t bufsiz"
 .Sh DESCRIPTION
 The
 .Fn readlink