diff --git a/.travis.yml b/.travis.yml
index 1ca8854ba..dab1cb53d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,7 +27,7 @@ before_install:
   - source ${TRAVIS}/travis_setup_env.sh
 
 install:
-  - pip install cpplint pylint --user `whoami`
+  - pip install cpplint pylint numpy --user `whoami`
 
 script: scripts/travis_script.sh