diff --git a/tests/conftest.py b/tests/conftest.py
index a9acb54..7370294 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -2,7 +2,7 @@
 
 from cryptography.hazmat.backends import _ALL_BACKENDS
 from cryptography.hazmat.backends.interfaces import (
-    HMACBackend, CipherBackend, HashBackend
+    HMACBackend, CipherBackend, HashBackend, PBKDF2Backend
 )
 
 from .utils import check_for_iface, check_backend_support, select_backends
@@ -21,6 +21,7 @@
     check_for_iface("hmac", HMACBackend, item)
     check_for_iface("cipher", CipherBackend, item)
     check_for_iface("hash", HashBackend, item)
+    check_for_iface("pbkdf2", PBKDF2Backend, item)
     check_backend_support(item)