diff --git a/tests/travis_install.sh b/tests/travis_install.sh
index 226a553a75fd0cfa0b15f1f8ff6af8a489218dad..5eaf44ffb12584b013fbfb0332e8e22d4fea2aaa 100644
--- a/tests/travis_install.sh
+++ b/tests/travis_install.sh
@@ -44,6 +44,7 @@ fi
 pip install -U pip setuptools
 pip install tox
 pip install codecov
+pip install sphinx
 # use newest pystencils
 pip install git+https://github.com/mabau/pystencils.git
 pip install flake8