diff --git a/.travis.yml b/.travis.yml
index 3afc9c3..1ee768b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,8 +17,9 @@ env:
     - TOX_ENV=py35
     - TOX_ENV=flake8
 cache:
-  - pip
-  - ~/.ethash
+  pip: true
+  directories:
+    - ~/.ethash
 install:
   - "travis_retry pip install setuptools --upgrade"
   - "travis_retry pip install tox"