diff --git a/tests/run-pass/rc.rs b/tests/run-pass/rc.rs
index af68e5cfd1fa..164842ab4d97 100644
--- a/tests/run-pass/rc.rs
+++ b/tests/run-pass/rc.rs
@@ -65,7 +65,7 @@ fn rc_fat_ptr_eq() {
     let p = Rc::new(1) as Rc<Debug>;
     let a: *const Debug = &*p;
     let r = Rc::into_raw(p);
-    let _b = a == r;
+    assert!(a == r);
     drop(unsafe { Rc::from_raw(r) });
 }