diff --git a/.travis.yml b/.travis.yml
index 1e946a8df..ec08a8d56 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,7 +30,7 @@ before_install:
 script:
 - git tag tmp-travis-build
 - sh travis/git-info.sh
-- sphinx-build -qW . docs/html
+- sphinx-build -qW -j3 . docs/html
 - python travis/pr-check-base.py
 - python travis/lint.py
 - python travis/authors-rst.py