diff --git a/.travis.yml b/.travis.yml
index 712174ef..def962b7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ install:
   - echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
   - echo "deb http://download.mono-project.com/repo/debian wheezy-libtiff-compat main" | sudo tee -a /etc/apt/sources.list.d/mono-xamarin.list
   - sudo apt-get update -qq
-  - sudo apt-get install -y mono-devel nuget
+  - sudo apt-get install -y mono-devel nuget p7zip-full
   - nuget install NUnit.Runners -Version 2.6.4 -OutputDirectory testrunner
   - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
   - wget https://www.dropbox.com/s/zxigif3vghsdfli/llvm_linux_x86_64.7z?dl=0