diff --git a/.travis.yml b/.travis.yml
index e5af3cd231..08e745f9ae 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,5 +15,7 @@ install:
   - make install
   - export LD_LIBRARY_PATH="$HOME/libuvinstall/lib"
   - cd $OLDPWD
+mono:
+  - 4.0.5
 script:
   - ./build.sh --quiet verify