diff --git a/.travis.yml b/.travis.yml
index 1f8a364..57f351a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,7 @@ rust:
   - nightly
 
 before_script:
+  - rustup component add rust-src
   - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
   - (test -x $HOME/.cargo/bin/cargo-xbuild || cargo install cargo-xbuild)
   - (test -x $HOME/.cargo/bin/cargo-make || cargo install cargo-make)