diff --git a/src/lib.rs b/src/lib.rs
index d5a5b99..5d6a458 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -90,6 +90,7 @@
 #![cfg_attr(any(proc_macro_span, super_unstable), feature(proc_macro_span))]
 #![cfg_attr(super_unstable, feature(proc_macro_def_site))]
 #![cfg_attr(doc_cfg, feature(doc_cfg))]
+#![deny(unsafe_op_in_unsafe_fn)]
 #![allow(
     clippy::cast_lossless,
     clippy::cast_possible_truncation,