diff --git a/example/std_example.rs b/example/std_example.rs
index e28da13e4c8..63227acc4bd 100644
--- a/example/std_example.rs
+++ b/example/std_example.rs
@@ -6,6 +6,9 @@ use std::intrinsics;
 
 
 fn main() {
+    let mutex = std::sync::Mutex::new(());
+    mutex.lock().unwrap();
+
     let _ = ::std::iter::repeat('a' as u8).take(10).collect::<Vec<_>>();
     let stderr = ::std::io::stderr();
     let mut stderr = stderr.lock();