diff --git a/tests/test_ensure.rs b/tests/test_ensure.rs
index 100b378..5fe5278 100644
--- a/tests/test_ensure.rs
+++ b/tests/test_ensure.rs
@@ -614,6 +614,7 @@ fn test_as() {
 
     extern "C" fn extern_fn() {}
     #[rustfmt::skip]
+    #[allow(missing_abi)]
     let test = || Ok(ensure!(extern_fn as extern fn() as usize * 0 != 0));
     assert_err(
         test,