diff --git a/cli/src/main.rs b/cli/src/main.rs
index d62df670..7653e33f 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -124,7 +124,7 @@ struct CommonArgs {
     )]
     relay_server: Vec<url::Url>,
     /// Use a custom rendezvous server. Both sides need to use the same value in order to find each other.
-    #[arg(long, value_name = "ws://example.org", value_hint = clap::ValueHint::Url, env = "WORMHOLE_TRANSIT_HELPER")]
+    #[arg(long, value_name = "ws://example.org", value_hint = clap::ValueHint::Url, env = "WORMHOLE_MAILBOX_URL")]
     rendezvous_server: Option<url::Url>,
     /// Disable the relay server support and force a direct connection.
     #[arg(long)]