diff --git a/tests/crashes/122903-1.rs b/tests/crashes/122903-1.rs
index 9323c435851..0953962ed9e 100644
--- a/tests/crashes/122903-1.rs
+++ b/tests/crashes/122903-1.rs
@@ -1,7 +1,7 @@
 //@ known-bug: #122903
 impl Struct {
-    async fn box_box_ref_Struct(
-        self: Box<Box<Self, impl FnMut(&mut Box<Box<Self, impl FnMut(&mut Self)>>)>>,
+    fn box_box_ref_Struct(
+        self: impl FnMut(Box<impl FnMut(&mut Self)>),
     ) -> &u32 {
         f
     }