diff --git a/rumqttd/demo.toml b/rumqttd/demo.toml
index aa58e4bf6..ca7433556 100644
--- a/rumqttd/demo.toml
+++ b/rumqttd/demo.toml
@@ -57,7 +57,7 @@ next_connection_delay_ms = 1
 
 [prometheus]
 port = 9042
-timeout = 1
+interval = 1
 
 [ws]
 
diff --git a/rumqttd/src/server/broker.rs b/rumqttd/src/server/broker.rs
index 8b2f93929..0941f35a8 100644
--- a/rumqttd/src/server/broker.rs
+++ b/rumqttd/src/server/broker.rs
@@ -212,7 +212,7 @@ impl Broker {
 
         if let Some(prometheus_setting) = &self.config.prometheus {
             let port = prometheus_setting.port;
-            let timeout = prometheus_setting.timeout;
+            let timeout = prometheus_setting.interval;
             let metrics_thread = thread::Builder::new().name("Metrics".to_owned());
             let meter_link = self.meters().unwrap();
             metrics_thread.spawn(move || {