diff --git a/examples/rtt-timing.rs b/examples/rtt-timing.rs
index 7e1ee0636777379a6de82ece3a97c708830f81a0..ba15f8d86c0c0aff158ff8d9309de121bbe3d3ee 100644
--- a/examples/rtt-timing.rs
+++ b/examples/rtt-timing.rs
@@ -1,8 +1,7 @@
 //! examples/rtt_timing.rs
 //! cargo run --examples rtt-timing
 
-// #![deny(unsafe_code)]
-// #![deny(warnings)]
+#![deny(warnings)]
 #![no_main]
 #![no_std]