diff --git a/.travis.yml b/.travis.yml
index 6e26860f1..fa33cf0a6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,11 +9,13 @@ install:
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get -qq update; fi
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get -qq install cmake libqt4-dev libgcrypt11-dev zlib1g-dev libxtst-dev; fi
   - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew update; fi
-  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew install cmake qt libgcrypt; fi
+  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew ls | grep -wq cmake || brew install cmake; fi
+  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew ls | grep -wq qt || brew install qt; fi
+  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew ls | grep -wq libgcrypt || brew install libgcrypt; fi
 before_script: mkdir build && pushd build
 script:
   - cmake -DCMAKE_BUILD_TYPE=Debug -DWITH_GUI_TESTS=ON ..
   - make
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then make test ARGS+="-E testgui --output-on-failure"; fi
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then xvfb-run -a --server-args="-screen 0 800x600x24" make test ARGS+="-R testgui --output-on-failure"; fi
-  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then make test; fi
+  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then make test ARGS+="--output-on-failure"; fi