diff --git a/libc/kernel/uapi/linux/mount.h b/libc/kernel/uapi/linux/mount.h
index 28f233a..e48555c 100644
--- a/libc/kernel/uapi/linux/mount.h
+++ b/libc/kernel/uapi/linux/mount.h
@@ -79,6 +79,7 @@
   FSCONFIG_SET_FD = 5,
   FSCONFIG_CMD_CREATE = 6,
   FSCONFIG_CMD_RECONFIGURE = 7,
+  FSCONFIG_CMD_CREATE_EXCL = 8,
 };
 #define FSMOUNT_CLOEXEC 0x00000001
 #define MOUNT_ATTR_RDONLY 0x00000001