diff --git a/src/lib.rs b/src/lib.rs
index 7eec708..70b114a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
 #![allow(clippy::must_use_candidate)]
+#![forbid(unsafe_code)]
 
 use std::collections::HashSet;