diff --git a/.travis.yml b/.travis.yml
index 2afbcf2..15f1c42 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ language: python
 python:
   - "3.7"
 install:
-  - pip install coverage codecov
+  - pip install coverage codecov pyvcd
 script:
   - coverage run -m unittest discover
   - codecov