diff --git a/.travis.yml b/.travis.yml
index 4e8383a..ddece48 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -81,8 +81,11 @@ install:
   # lgi is too old
   - travis_retry luarocks --local install lgi
 
+  - gem install mdl
+
 script:
   - PKG_CONFIG_PATH="$HOME/install/lib/pkgconfig" make build_for_travis
+  - mdl --git-recurse .
 
 after_success:
   - |