diff --git a/.travis.yml b/.travis.yml
index c935e65f52ecfc13f58cdc6d028be71c0df312a9..e8f2c857272af440aab163586357c22be763afcb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -57,6 +57,7 @@ addons:
     - libopenscenegraph-dev
     - libsdl1.2-dev
     - libudev-dev
+    - python-openssl
     - texlive-font-utils
 
 cache: