diff --git a/.travis.yml b/.travis.yml
index 43bb73c..3de0718 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,7 @@ before_install:
   - sudo add-apt-repository ppa:zarquon42/travis-trusty -y
   - sudo apt-get update -qq
   - curl -OL http://raw.github.com/craigcitro/r-travis/master/scripts/travis-tool.sh
+  - export RGL_USE_NULL=TRUE
   - chmod 755 ./travis-tool.sh
   - ./travis-tool.sh bootstrap
   - ./travis-tool.sh install_r_binary rgl Rcpp RcppEigen RcppArmadillo foreach doParallel yaImpute testthat car colorRamps shapes rvcg