diff --git a/.travis.yml b/.travis.yml
index abc583a44f62a169059b177cabed55bfe3ab9183..3d4c7d8d6cc14b65a42fef763027e4430760db66 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ cache:
   - pip
   - directories:
       - $HOME/.pre-commit
+      - $HOME/virtualenv
 
 install:
   - pip install -r tests/requirements.txt | cat