diff --git a/kart/point_cloud/pdal_convert.py b/kart/point_cloud/pdal_convert.py
index 9567d3d4..fa156af9 100644
--- a/kart/point_cloud/pdal_convert.py
+++ b/kart/point_cloud/pdal_convert.py
@@ -23,7 +23,12 @@ def convert_tile_to_copc(source, dest):
             "type": "readers.las",
             "filename": str(source),
         },
-        {"type": "writers.copc", "filename": str(dest), "forward": "all"},
+        {
+            "type": "writers.copc",
+            "filename": str(dest),
+            "forward": "all",
+            "extra_dims": "all",
+        },
     ]
     try:
         pdal_execute_pipeline(pipeline)