diff --git a/tests/__init__.py b/tests/__init__.py
index e9466ea4..4c965300 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -19,6 +19,10 @@
 
 from os import getenv, path
 
+import cyclonedx
+
+CDX_SCHEMA_DIRECTORY = path.join(path.dirname(cyclonedx.__file__), 'schema')
+
 FIXTURES_DIRECTORY = path.join(path.dirname(__file__), 'fixtures')
 
 RECREATE_SNAPSHOTS = bool(getenv('CDX_TEST_RECREATE_SNAPSHOTS'))
diff --git a/tests/base.py b/tests/base.py
index 35fcc3d6..76dee340 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -42,10 +42,11 @@
 else:
     from importlib_metadata import version
 
+from . import CDX_SCHEMA_DIRECTORY
+
 cyclonedx_lib_name: str = 'cyclonedx-python-lib'
 cyclonedx_lib_version: str = version(cyclonedx_lib_name)
 single_uuid: str = 'urn:uuid:{}'.format(uuid4())
-schema_directory = os.path.join(os.path.dirname(__file__), '..', 'cyclonedx', 'schema')
 
 
 class BaseJsonTestCase(TestCase):
@@ -53,7 +54,7 @@ class BaseJsonTestCase(TestCase):
     def assertValidAgainstSchema(self, bom_json: str, schema_version: SchemaVersion) -> None:
         if sys.version_info >= (3, 7):
             schema_fn = os.path.join(
-                schema_directory,
+                CDX_SCHEMA_DIRECTORY,
                 f'bom-{schema_version.name.replace("_", ".").replace("V", "")}.schema.json'
             )
             with open(schema_fn) as schema_fd:
@@ -107,7 +108,7 @@ def assertEqualJsonBom(self, a: str, b: str) -> None:
 class BaseXmlTestCase(TestCase):
 
     def assertValidAgainstSchema(self, bom_xml: str, schema_version: SchemaVersion) -> None:
-        xsd_fn = os.path.join(schema_directory, f'bom-{schema_version.name.replace("_", ".").replace("V", "")}.xsd')
+        xsd_fn = os.path.join(CDX_SCHEMA_DIRECTORY, f'bom-{schema_version.name.replace("_", ".").replace("V", "")}.xsd')
         with open(xsd_fn) as xsd_fd:
             xsd_doc = etree.parse(xsd_fd)
 
diff --git a/tests/test_spdx.py b/tests/test_spdx.py
index 6395f86d..ff4c951b 100644
--- a/tests/test_spdx.py
+++ b/tests/test_spdx.py
@@ -19,14 +19,16 @@
 
 from itertools import chain
 from json import load as json_load
-from os.path import dirname, join as path_join
+from os.path import join as path_join
 from unittest import TestCase
 
 from ddt import data, ddt, idata, unpack
 
 from cyclonedx import spdx
 
-with open(path_join(dirname(__file__), '..', 'cyclonedx', 'schema', 'spdx.schema.json')) as spdx_schema:
+from . import CDX_SCHEMA_DIRECTORY
+
+with open(path_join(CDX_SCHEMA_DIRECTORY, 'spdx.schema.json')) as spdx_schema:
     KNOWN_SPDX_IDS = json_load(spdx_schema)['enum']
 
 VALID_COMPOUND_EXPRESSIONS = {