diff --git a/ices/67981.rs b/ices/67981.rs
index 10c2c6b9..8dab7b3a 100644
--- a/ices/67981.rs
+++ b/ices/67981.rs
@@ -1,4 +1,4 @@
-#![feature(unsized_locals)]
+#![feature(unsized_fn_params)]
 
 fn main() {
     let f: fn([u8]) = |_| {};
diff --git a/ices/68538.rs b/ices/68538.rs
index 06c77d06..576f67c8 100644
--- a/ices/68538.rs
+++ b/ices/68538.rs
@@ -1,4 +1,4 @@
-#![feature(unsized_locals)]
+#![feature(unsized_fn_params)]
 #![crate_type = "lib"]
 
 pub fn take_unsized_slice(s: [u8]) {
diff --git a/ices/68543.rs b/ices/68543.rs
index 5d1307a0..046057da 100644
--- a/ices/68543.rs
+++ b/ices/68543.rs
@@ -1,4 +1,4 @@
-#![feature(unsized_locals)]
+#![feature(unsized_fn_params, unsized_locals)]
 #![crate_type = "lib"]
 
 use std::future::Future;