diff --git a/include/unistd.h b/include/unistd.h
index a3a2c017014b..53efe498b681 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -566,7 +566,7 @@ int	fchmodat(int, const char *, mode_t, int);
 int	fchownat(int, const char *, uid_t, gid_t, int);
 int	fexecve(int, char *const [], char *const []);
 int	linkat(int, const char *, int, const char *, int);
-ssize_t	readlinkat(int, const char *, char *, size_t);
+ssize_t	readlinkat(int, const char * __restrict, char * __restrict, size_t);
 int	symlinkat(const char *, int, const char *);
 int	unlinkat(int, const char *, int);
 #endif /* __BSD_VISIBLE */