diff --git a/src/lib.rs b/src/lib.rs
index a1cfa9c..5687eff 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
 #![doc = include_str!("../README.md")]
+#![forbid(unsafe_code)]
 
 use std::time::Instant;