diff --git a/src/libcore/tests/time.rs b/src/libcore/tests/time.rs
index 273f1258bb090..c1fbdf7df76fc 100644
--- a/src/libcore/tests/time.rs
+++ b/src/libcore/tests/time.rs
@@ -11,6 +11,12 @@ fn creation() {
     assert_eq!(Duration::from_millis(4000), Duration::new(4, 0));
 }
 
+#[test]
+#[should_panic]
+fn new_overflow() {
+    let _ = Duration::new(::core::u64::MAX, 1_000_000_000);
+}
+
 #[test]
 fn secs() {
     assert_eq!(Duration::new(0, 0).as_secs(), 0);