diff --git a/.travis.yml b/.travis.yml
index 0e8bf4bdf6a..b862b3c5e46 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,8 @@ cache: cargo
 
 dist: trusty
 
+sudo: required
+
 addons:
   apt:
     sources:
diff --git a/wayland-scanner/src/util.rs b/wayland-scanner/src/util.rs
index 6cf70754e73..5e65e267cdd 100644
--- a/wayland-scanner/src/util.rs
+++ b/wayland-scanner/src/util.rs
@@ -1,3 +1,6 @@
+#[allow(unused_imports)]
+use std::ascii::AsciiExt;
+
 pub fn is_keyword(txt: &str) -> bool {
     match txt {
         "abstract" | "alignof" | "as" | "become" | "box" | "break" | "const" | "continue" | "crate"