diff --git a/library/alloc/tests/str.rs b/library/alloc/tests/str.rs
index c1dbbde08b6..0ba5d088f61 100644
--- a/library/alloc/tests/str.rs
+++ b/library/alloc/tests/str.rs
@@ -1,3 +1,5 @@
+#![cfg_attr(not(bootstrap), allow(invalid_from_utf8))]
+
 use std::assert_matches::assert_matches;
 use std::borrow::Cow;
 use std::cmp::Ordering::{Equal, Greater, Less};
diff --git a/tests/ui/process/process-panic-after-fork.rs b/tests/ui/process/process-panic-after-fork.rs
index da268312173..7c2fc296bb0 100644
--- a/tests/ui/process/process-panic-after-fork.rs
+++ b/tests/ui/process/process-panic-after-fork.rs
@@ -11,6 +11,8 @@
 #![feature(never_type)]
 #![feature(panic_always_abort)]
 
+#![allow(invalid_from_utf8)]
+
 extern crate libc;
 
 use std::alloc::{GlobalAlloc, Layout};