diff --git a/src/lib.rs b/src/lib.rs
index db5df54..34656bd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,4 @@
-use std::collections::{BTreeSet, HashSet};
+use std::collections::BTreeSet;
 
 use anyhow::Result;
 use bytes::Bytes;
@@ -11,7 +11,7 @@ pub struct RelayServer {
     pub db_users: sled::Tree,
 
     pub known_good_hosts: Mutex<BTreeSet<String>>,
-    pub active_indexers: Mutex<HashSet<String>>,
+    pub active_indexers: Mutex<BTreeSet<String>>,
 
     pub event_tx: mpsc::Sender<StreamEvent>,
     pub raw_block_tx: broadcast::Sender<Bytes>,