diff --git a/tools/perf/trace/beauty/include/uapi/linux/mount.h b/tools/perf/trace/beauty/include/uapi/linux/mount.h
index 2204708dbf7a..ac865edac517 100644
--- a/tools/perf/trace/beauty/include/uapi/linux/mount.h
+++ b/tools/perf/trace/beauty/include/uapi/linux/mount.h
@@ -63,6 +63,7 @@
  */
 #define OPEN_TREE_CLONE		(1 << 0)	/* Clone the target tree and attach the clone */
 #define OPEN_TREE_NAMESPACE	(1 << 1)	/* Clone the target tree into a new mount namespace */
+#define OPEN_TREE_DROP_MNTNS_MOUNTS	(1 << 2)	/* Drop mntns mounts from the clone */
 #define OPEN_TREE_CLOEXEC	O_CLOEXEC	/* Close the file on execve() */
 
 /*