diff --git a/.travis.yml b/.travis.yml
index 1d9314b7ab85e80499effc95b75e1bda2765714c..33aca913f07bd3608ab87381865bcc4fb35d110d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ python:
 
 install: 
   - pip install --user sphinx # sphinx_rtd_theme
-  - python -m pip install https://github.com/rtfd/sphinx_rtd_theme/archive/master.zip -U
+  - sudo python -m pip install https://github.com/rtfd/sphinx_rtd_theme/archive/master.zip -U
 
 script: bash ./build_and_deploy.sh