diff --git a/.travis.yml b/.travis.yml
index 66be063..72046f6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,7 +15,9 @@ env:
     - TOX_ENV=py34
     - TOX_ENV=py35
     - TOX_ENV=flake8
-cache: pip
+cache:
+  - pip
+  - ~/.ethash
 install:
   - "travis_retry pip install setuptools --upgrade"
   - "travis_retry pip install tox"