diff --git a/blender_asset_tracer/tracer/cdefs.py b/blender_asset_tracer/cdefs.py
similarity index 97%
rename from blender_asset_tracer/tracer/cdefs.py
rename to blender_asset_tracer/cdefs.py
index 7b658a7..d10530e 100644
--- a/blender_asset_tracer/tracer/cdefs.py
+++ b/blender_asset_tracer/cdefs.py
@@ -53,3 +53,6 @@ PTCACHE_EXTERNAL = 512
 # BKE_pointcache.h
 PTCACHE_EXT = b'.bphys'
 PTCACHE_PATH = b'blendcache_'
+
+# BKE_node.h
+CMP_NODE_R_LAYERS = 221
diff --git a/blender_asset_tracer/tracer/blocks2assets.py b/blender_asset_tracer/tracer/blocks2assets.py
index 06c2c18..348a997 100644
--- a/blender_asset_tracer/tracer/blocks2assets.py
+++ b/blender_asset_tracer/tracer/blocks2assets.py
@@ -7,9 +7,9 @@ import functools
 import logging
 import typing
 
-from blender_asset_tracer import blendfile, bpathlib
+from blender_asset_tracer import blendfile, bpathlib, cdefs
 from blender_asset_tracer.blendfile import iterators
-from . import result, cdefs, modifier_walkers
+from . import result, modifier_walkers
 
 log = logging.getLogger(__name__)
 
diff --git a/blender_asset_tracer/tracer/modifier_walkers.py b/blender_asset_tracer/tracer/modifier_walkers.py
index 7350b94..4f3286a 100644
--- a/blender_asset_tracer/tracer/modifier_walkers.py
+++ b/blender_asset_tracer/tracer/modifier_walkers.py
@@ -5,8 +5,8 @@ files used by the modifiers.
 """
 import typing
 
-from blender_asset_tracer import blendfile, bpathlib
-from . import result, cdefs
+from blender_asset_tracer import blendfile, bpathlib, cdefs
+from . import result
 
 
 def _modifier_filepath(modifier: blendfile.BlendFileBlock, block_name: bytes) \