diff --git a/docs/how-to-run-simulated.adoc b/docs/how-to-run-simulated.adoc
index 039cc0d662..5b21e9df09 100644
--- a/docs/how-to-run-simulated.adoc
+++ b/docs/how-to-run-simulated.adoc
@@ -122,9 +122,7 @@ Nexus can also serve the web console. Instructions for generating the static ass
 +
 [source,text]
 ----
-$ cargo run --bin=sled-agent-sim -- $(uuidgen) 127.0.0.1:12345 127.0.0.1:12221
-...
-Jun 02 12:21:50.989 INFO listening, local_addr: 127.0.0.1:12345, component: dropshot
+$ cargo run --bin=sled-agent-sim -- $(uuidgen) [::1]:12345 127.0.0.1:12221
 ----
 
 . `oximeter` is similar to `nexus`, requiring a configuration file. You can use `oximeter/collector/config.toml`, and the whole thing can be run with:
diff --git a/sled-agent/src/bin/sled-agent-sim.rs b/sled-agent/src/bin/sled-agent-sim.rs
index 61adec0ce5..4aa2553301 100644
--- a/sled-agent/src/bin/sled-agent-sim.rs
+++ b/sled-agent/src/bin/sled-agent-sim.rs
@@ -15,6 +15,7 @@ use omicron_sled_agent::sim::{
     run_server, Config, ConfigStorage, ConfigZpool, SimMode,
 };
 use std::net::SocketAddr;
+use std::net::SocketAddrV6;
 use structopt::StructOpt;
 use uuid::Uuid;
 
@@ -44,7 +45,7 @@ struct Args {
     uuid: Uuid,
 
     #[structopt(name = "SA_IP:PORT", parse(try_from_str))]
-    sled_agent_addr: SocketAddr,
+    sled_agent_addr: SocketAddrV6,
 
     #[structopt(name = "NEXUS_IP:PORT", parse(try_from_str))]
     nexus_addr: SocketAddr,
@@ -67,7 +68,7 @@ async fn do_run() -> Result<(), CmdError> {
         sim_mode: args.sim_mode,
         nexus_address: args.nexus_addr,
         dropshot: ConfigDropshot {
-            bind_address: args.sled_agent_addr,
+            bind_address: args.sled_agent_addr.into(),
             request_body_max_bytes: 1024 * 1024,
             ..Default::default()
         },
@@ -75,7 +76,7 @@ async fn do_run() -> Result<(), CmdError> {
         storage: ConfigStorage {
             // Create 10 "virtual" U.2s, with 1 TB of storage.
             zpools: vec![ConfigZpool { size: 1 << 40 }; 10],
-            ip: args.sled_agent_addr.ip(),
+            ip: (*args.sled_agent_addr.ip()).into(),
         },
     };