diff --git a/tests/functional/pyocf/types/volume_cache.py b/tests/functional/pyocf/types/volume_cache.py
index 5865ec1..5faa834 100644
--- a/tests/functional/pyocf/types/volume_cache.py
+++ b/tests/functional/pyocf/types/volume_cache.py
@@ -8,11 +8,11 @@ from ctypes import cast, POINTER
 from .cache import Cache
 from .io import Io
 from .io import IoDir
-from .volume_exp_obj import ExpObjVolume
+from .volume_exp_obj import OcfInternalVolume
 from .volume import Volume
 
 
-class CacheVolume(ExpObjVolume):
+class CacheVolume(OcfInternalVolume):
     def __init__(self, cache, open=False, uuid=None):
         super().__init__(cache, uuid)
         self.cache = cache
diff --git a/tests/functional/pyocf/types/volume_core.py b/tests/functional/pyocf/types/volume_core.py
index 02a7695..71c9999 100644
--- a/tests/functional/pyocf/types/volume_core.py
+++ b/tests/functional/pyocf/types/volume_core.py
@@ -4,12 +4,12 @@
 #
 
 from .core import Core
-from .volume_exp_obj import ExpObjVolume
+from .volume_exp_obj import OcfInternalVolume
 from .io import IoDir
 from .volume import Volume
 
 
-class CoreVolume(ExpObjVolume):
+class CoreVolume(OcfInternalVolume):
     def __init__(self, core, open=False, uuid=None):
         super().__init__(core, uuid)
         self.core = core
diff --git a/tests/functional/pyocf/types/volume_exp_obj.py b/tests/functional/pyocf/types/volume_exp_obj.py
index 6409a9b..b2838ae 100644
--- a/tests/functional/pyocf/types/volume_exp_obj.py
+++ b/tests/functional/pyocf/types/volume_exp_obj.py
@@ -14,7 +14,7 @@ from pyocf.types.io import IoDir, Io
 from pyocf.types.shared import OcfCompletion
 
 
-class ExpObjVolume(Volume):
+class OcfInternalVolume(Volume):
     def __init__(self, parent, uuid=None):
         super().__init__(uuid)
         self.parent = parent