diff --git a/.travis.yml b/.travis.yml
index bfbfcee..e4c8a29 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ addons:
     sources:
       - sourceline: 'ppa:ubuntu-toolchain-r/test'
     packages:
+      - python-software-properties
       - python
       - cmake
       - build-essential