diff --git a/.travis.yml b/.travis.yml
index b62e91c5b..28b32f154 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,6 +13,7 @@ addons:
     packages:
       - expect-dev # provides unbuffer utility
       - graphviz
+      - "swig"
 
 stages:
   - test