diff --git a/.travis.yml b/.travis.yml
index dc4e6eb..ef3b798 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -36,7 +36,7 @@ matrix:
 install:
   - |
     if [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then
-        brew install cmake boost python gcc
+        brew install cmake boost python gcc open-mpi
         pip install virtualenv
     elif [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
         pip install --user virtualenv