diff --git a/tests/ui/sanitizer/cfi/coroutine.rs b/tests/ui/sanitizer/cfi/coroutine.rs
index 3ad896afd00b0..39a754f103637 100644
--- a/tests/ui/sanitizer/cfi/coroutine.rs
+++ b/tests/ui/sanitizer/cfi/coroutine.rs
@@ -26,7 +26,7 @@ use std::async_iter::AsyncIterator;
 
 #[test]
 fn general_coroutine() {
-    let mut coro = #[coroutine] |x: i32| {
+    let coro = #[coroutine] |x: i32| {
         yield x;
         "done"
     };