diff --git a/tests/conftest.py b/tests/conftest.py
index c597820..36183f4 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -15,7 +15,7 @@
 
 import pytest
 
-from cryptography.hazmat.backends import available_backends
+from cryptography.hazmat.backends import _available_backends
 from cryptography.hazmat.backends.interfaces import (
     HMACBackend, CipherBackend, HashBackend, PBKDF2HMACBackend, RSABackend
 )
@@ -25,7 +25,7 @@
 
 def pytest_generate_tests(metafunc):
     names = metafunc.config.getoption("--backend")
-    selected_backends = select_backends(names, available_backends())
+    selected_backends = select_backends(names, _available_backends())
 
     if "backend" in metafunc.fixturenames:
         metafunc.parametrize("backend", selected_backends)