diff --git a/.travis.yml b/.travis.yml
index 14d95fa84..118105bc1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -42,4 +42,7 @@ matrix:
     - env: JYTHON=true; YTDL_TEST_SET=download
 before_install:
   - if [ "$JYTHON" == "true" ]; then ./devscripts/install_jython.sh; export PATH="$HOME/jython/bin:$PATH"; fi
-script: ./devscripts/run_tests.sh
+script:
+  - pip install flake8
+  - flake8 .
+  - ./devscripts/run_tests.sh