diff --git a/jit/src/lib.rs b/jit/src/lib.rs
index 6079d00f2f..c0f043131e 100644
--- a/jit/src/lib.rs
+++ b/jit/src/lib.rs
@@ -1,4 +1,5 @@
 //! Shared code between YJIT and ZJIT.
+#![warn(unsafe_op_in_unsafe_fn)] // Adopt 2024 edition default when targeting 2021 editions
 
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::alloc::{GlobalAlloc, Layout, System};