diff --git a/core/rs/core/src/bootstrap.rs b/core/rs/core/src/bootstrap.rs
index 75918d567..3471de420 100644
--- a/core/rs/core/src/bootstrap.rs
+++ b/core/rs/core/src/bootstrap.rs
@@ -240,6 +240,11 @@ pub fn create_clock_table(
         "CREATE INDEX IF NOT EXISTS \"{table_name}__crsql_clock_dbv_idx\" ON \"{table_name}__crsql_clock\" (\"site_id\", \"db_version\")",
         table_name = crate::util::escape_ident(table_name),
         ))?;
+    db.exec_safe(
+        &format!(
+        "CREATE INDEX IF NOT EXISTS \"{table_name}__crsql_clock_ts_idx\" ON \"{table_name}__crsql_clock\" (\"ts\")",
+        table_name = crate::util::escape_ident(table_name),
+        ))?;
     db.exec_safe(
         &format!(
         "CREATE TABLE IF NOT EXISTS \"{table_name}__crsql_pks\" (__crsql_key INTEGER PRIMARY KEY, {pk_list})",