diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index ea695c4a7a3fb13cb638e29f1b9e082df4124422..0e44c6765b5130ad74f010216eb91ef69d1b1b5a 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -178,6 +178,9 @@ int v9fs_uflags2omode(int uflags, int extended)
 		break;
 	}
 
+	if (uflags & O_TRUNC)
+		ret |= P9_OTRUNC;
+
 	if (extended) {
 		if (uflags & O_EXCL)
 			ret |= P9_OEXCL;