diff --git a/src/doc/rustc-dev-guide/.travis.yml b/src/doc/rustc-dev-guide/.travis.yml
index 55ea2058764c..fc6f4f05e571 100644
--- a/src/doc/rustc-dev-guide/.travis.yml
+++ b/src/doc/rustc-dev-guide/.travis.yml
@@ -1,4 +1,6 @@
 language: rust
+rust:
+- nightly
 cache:
 - cargo
 before_install: