diff --git a/doc/book/cookbook/monitoring.md b/doc/book/cookbook/monitoring.md
index b204dbbe..d643a9ca 100644
--- a/doc/book/cookbook/monitoring.md
+++ b/doc/book/cookbook/monitoring.md
@@ -18,7 +18,7 @@ api_bind_addr = "0.0.0.0:3903"
 ```
 
 This will allow anyone to scrape Prometheus metrics by fetching
-`http://localhost:3093/metrics`. If you want to restrict access
+`http://localhost:3903/metrics`. If you want to restrict access
 to the exported metrics, set the `metrics_token` configuration value
 to a bearer token to be used when fetching the metrics endpoint.