diff --git a/installers/charm/nbi/tests/test_charm.py b/installers/charm/nbi/tests/test_charm.py
index c4e857f..2b4ea0f 100644
--- a/installers/charm/nbi/tests/test_charm.py
+++ b/installers/charm/nbi/tests/test_charm.py
@@ -48,6 +48,7 @@
             "ingress_whitelist_source_range": "",
             "tls_secret_name": "",
             "site_url": "https://nbi.192.168.100.100.xip.io",
+            "cluster_issuer": "vault-issuer",
         }
         self.harness.update_config(self.config)