diff --git a/modules/monitoring.nix b/modules/monitoring.nix
index 0f9f369..172dc1f 100644
--- a/modules/monitoring.nix
+++ b/modules/monitoring.nix
@@ -70,6 +70,7 @@ with pkgs;
               "localhost:${toString config.services.prometheus.exporters.node.port}"
               "localhost:${toString config.services.prometheus.exporters.postgres.port}"
               "localhost:${toString config.services.prometheus.exporters.smartctl.port}"
+              "localhost:9641" # MQTT2Prometheus
             ];
           }
         ];