diff --git a/.travis.yml b/.travis.yml
index 4732218..5736b6b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,8 @@ language: python
 python:
   - "3.7"
   - "3.8"
-install: "pip install -r portier/requirements.txt"
+install:
+  - pip install -r portier/requirements.txt
+  - pip install flake8
 script:
   - flake8