diff --git a/.travis.yml b/.travis.yml
index 08c0351a..c7e765eb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ install:
   - source activate testenv
   - conda install --yes $DEPS
   - python setup.py install
-  - jupyter nbextension install --py vega
+  - jupyter nbextension install vega --py --sys-prefix
 
 before_install:
   - wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh