diff --git a/magnum/conductor/handlers/common/cert_manager.py b/magnum/conductor/handlers/common/cert_manager.py
index 772dcd4817..cd03bb5ef1 100644
--- a/magnum/conductor/handlers/common/cert_manager.py
+++ b/magnum/conductor/handlers/common/cert_manager.py
@@ -86,12 +86,12 @@ def generate_certificates_to_bay(bay):
 
 
 def get_bay_ca_certificate(bay):
-    ca_cert = cert_manager.get_backend().CertManager.get_cert(bay.ca_cert_uuid)
+    ca_cert = cert_manager.get_backend().CertManager.get_cert(bay.ca_cert_ref)
     return ca_cert.get_certificate()
 
 
 def sign_node_certificate(bay, csr):
-    ca_cert = cert_manager.get_backend().CertManager.get_cert(bay.ca_cert_uuid)
+    ca_cert = cert_manager.get_backend().CertManager.get_cert(bay.ca_cert_ref)
     node_cert = x509.sign(csr, bay.name, ca_cert.get_private_key(),
                           ca_cert.get_private_key_passphrase())
     return node_cert
diff --git a/magnum/tests/unit/conductor/handlers/common/test_cert_manager.py b/magnum/tests/unit/conductor/handlers/common/test_cert_manager.py
index 12989c5507..6fb9c498d1 100644
--- a/magnum/tests/unit/conductor/handlers/common/test_cert_manager.py
+++ b/magnum/tests/unit/conductor/handlers/common/test_cert_manager.py
@@ -138,7 +138,7 @@ class CertManagerTestCase(base.BaseTestCase):
         bay_ca_cert = cert_manager.sign_node_certificate(mock_bay, mock_csr)
 
         self.CertManager.get_cert.assert_called_once_with(
-            mock_bay.ca_cert_uuid)
+            mock_bay.ca_cert_ref)
         mock_x509_sign.assert_called_once_with(mock_csr, mock_bay.name,
                                                mock.sentinel.priv_key,
                                                passphrase)
@@ -153,5 +153,5 @@ class CertManagerTestCase(base.BaseTestCase):
         bay_ca_cert = cert_manager.get_bay_ca_certificate(mock_bay)
 
         self.CertManager.get_cert.assert_called_once_with(
-            mock_bay.ca_cert_uuid)
+            mock_bay.ca_cert_ref)
         self.assertEqual(bay_ca_cert, mock.sentinel.certificate)