diff --git a/installers/charm/nbi/src/charm.py b/installers/charm/nbi/src/charm.py
index 0af4104..d3a2251 100755
--- a/installers/charm/nbi/src/charm.py
+++ b/installers/charm/nbi/src/charm.py
@@ -57,6 +57,7 @@
     max_file_size: int
     site_url: Optional[str]
     cluster_issuer: Optional[str]
+    ingress_class: Optional[str]
     ingress_whitelist_source_range: Optional[str]
     tls_secret_name: Optional[str]
     mongodb_uri: Optional[str]
@@ -249,8 +250,9 @@
                     else config.max_file_size
                 ),
                 "nginx.ingress.kubernetes.io/backend-protocol": "HTTPS",
-                "kubernetes.io/ingress.class": "public",
             }
+            if config.ingress_class:
+                annotations["kubernetes.io/ingress.class"] = config.ingress_class
             ingress_resource_builder = IngressResourceV3Builder(
                 f"{self.app.name}-ingress", annotations
             )