diff --git a/src/scheduler.rs b/src/scheduler.rs
index c77c7bb36..b2d7c3eef 100644
--- a/src/scheduler.rs
+++ b/src/scheduler.rs
@@ -1,3 +1,5 @@
+#![warn(clippy::indexing_slicing)]
+
 use async_std::prelude::*;
 use async_std::sync::{channel, Receiver, Sender};
 use async_std::task;