diff --git a/installers/charm/nbi/src/charm.py b/installers/charm/nbi/src/charm.py
index 7efc5b0..1f5812a 100755
--- a/installers/charm/nbi/src/charm.py
+++ b/installers/charm/nbi/src/charm.py
@@ -56,6 +56,7 @@
     log_level: str
     max_file_size: int
     site_url: Optional[str]
+    cluster_issuer: Optional[str]
     ingress_whitelist_source_range: Optional[str]
     tls_secret_name: Optional[str]
 
@@ -240,6 +241,9 @@
                     "nginx.ingress.kubernetes.io/whitelist-source-range"
                 ] = config.ingress_whitelist_source_range
 
+            if config.cluster_issuer:
+                annotations["cert-manager.io/cluster-issuer"] = config.cluster_issuer
+
             if parsed.scheme == "https":
                 ingress_resource_builder.add_tls(
                     [parsed.hostname], config.tls_secret_name