diff --git a/.travis.yml b/.travis.yml
index 7efafc8e..d2130c78 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,7 @@ sudo: required
 before_install:
 - sudo apt-get -qq update
 - sudo apt-get install texlive texlive-latex3
+- sudo apt install texlive-latex-extra
 script:
 - ./build.sh
 deploy: