diff --git a/tests/ui/extern-mod-syntax.rs b/tests/ui/extern-mod-syntax.rs
index 230194c537793..65dfa6a0f5790 100644
--- a/tests/ui/extern-mod-syntax.rs
+++ b/tests/ui/extern-mod-syntax.rs
@@ -1,11 +1,11 @@
 // run-pass
 
 #![allow(unused_imports)]
-#![feature(rustc_private)]
+#![no_std]
 
-extern crate libc;
-use libc::c_void;
+extern crate std;
+use std::ffi::c_void;
 
 pub fn main() {
-    println!("Hello world!");
+    std::println!("Hello world!");
 }
diff --git a/tests/ui/issue-13560.rs b/tests/ui/issue-13560.rs
index 5f7d647e2301f..3397202bef2fd 100644
--- a/tests/ui/issue-13560.rs
+++ b/tests/ui/issue-13560.rs
@@ -1,4 +1,5 @@
 // run-pass
+// ignore-cross-compile (needs dylibs and compiletest doesn't have a more specific header)
 // aux-build:issue-13560-1.rs
 // aux-build:issue-13560-2.rs
 // aux-build:issue-13560-3.rs
diff --git a/tests/ui/std/switch-stdout.rs b/tests/ui/std/switch-stdout.rs
index e9501a809308b..2d936d96b0596 100644
--- a/tests/ui/std/switch-stdout.rs
+++ b/tests/ui/std/switch-stdout.rs
@@ -1,4 +1,5 @@
 // run-pass
+// ignore-wasm (needs file descriptors and env variables)
 
 use std::env;
 use std::fs::File;