diff --git a/src/basic/forward.h b/src/basic/forward.h
index 6b6d68dcb4..7b8ce78b98 100644
--- a/src/basic/forward.h
+++ b/src/basic/forward.h
@@ -36,6 +36,7 @@ struct in_addr;
 struct in6_addr;
 struct inotify_event;
 struct iovec;
+struct mount_attr;
 struct msghdr;
 struct passwd;
 struct pollfd;