diff --git a/src/shared/copy.c b/src/shared/copy.c
index db26945be8..5a4a8aaf0d 100644
--- a/src/shared/copy.c
+++ b/src/shared/copy.c
@@ -1133,8 +1133,11 @@ static int fd_copy_tree_generic(
                 copy_progress_path_t progress_path,
                 copy_progress_bytes_t progress_bytes,
                 void *userdata) {
+
         int r;
 
+        assert(!FLAGS_SET(copy_flags, COPY_LOCK_BSD));
+
         if (S_ISDIR(st->st_mode))
                 return fd_copy_directory(df, from, st, dt, to, original_device, depth_left-1, override_uid,
                                          override_gid, copy_flags, denylist, hardlink_context, display_path,