diff --git a/tests/functional/tests/conftest.py b/tests/functional/tests/conftest.py
index 2570769..f61e187 100644
--- a/tests/functional/tests/conftest.py
+++ b/tests/functional/tests/conftest.py
@@ -14,7 +14,9 @@ from pyocf.types.volume import RamVolume, ErrorDevice
 from pyocf.types.volume_cache import CacheVolume
 from pyocf.types.volume_core import CoreVolume
 from pyocf.types.volume_replicated import ReplicatedVolume
+from pyocf.types.cvolume import CVolume
 from pyocf.types.ctx import OcfCtx
+from pyocf.helpers import get_composite_volume_type_id
 
 default_registered_volumes = [RamVolume, ErrorDevice, CacheVolume, CoreVolume, ReplicatedVolume]
 
@@ -28,6 +30,7 @@ def pyocf_ctx():
     c = OcfCtx.with_defaults(DefaultLogger(LogLevel.WARN))
     for vol_type in default_registered_volumes:
         c.register_volume_type(vol_type)
+    c.register_internal_volume_type_id(CVolume, get_composite_volume_type_id())
     yield c
     c.exit()
     gc.collect()
@@ -39,6 +42,7 @@ def pyocf_ctx_log_buffer():
     c = OcfCtx.with_defaults(logger)
     for vol_type in default_registered_volumes:
         c.register_volume_type(vol_type)
+    c.register_internal_volume_type_id(CVolume, get_composite_volume_type_id())
     yield logger
     c.exit()
     gc.collect()
@@ -51,6 +55,8 @@ def pyocf_2_ctx():
     for vol_type in default_registered_volumes:
         c1.register_volume_type(vol_type)
         c2.register_volume_type(vol_type)
+    c1.register_internal_volume_type_id(CVolume, get_composite_volume_type_id())
+    c2.register_internal_volume_type_id(CVolume, get_composite_volume_type_id())
     yield [c1, c2]
     c1.exit()
     c2.exit()