diff --git a/.travis.yml b/.travis.yml
index 9f1b607d..9f31aedc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -61,6 +61,8 @@ jobs:
 
   - os: osx
     osx_image: xcode10.1
+    env:
+    - INSTALL_DIR="sfizz-${TRAVIS_BRANCH}-${TRAVIS_OS_NAME}-${TRAVIS_CPU_ARCH}"
 
   - os:   linux
     env: