diff --git a/.travis.yml b/.travis.yml
index d5926e22..7ee52ffd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,8 @@ matrix:
       osx_image: xcode7.2
 
 before_install:
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install cmake ; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get -qq update; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install -y groff; fi
 script: