diff --git a/.travis.yml b/.travis.yml
index 0302d5b..a6fe14d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,14 +13,11 @@ matrix:
       env: TOX_ENV=wheezy
 install:
   - pip install -U pip
-  - pip install flake8 tox
+  - pip install pyflakes tox
   - sudo rm -rf /dev/shm && sudo ln -s /run/shm /dev/shm
 script:
   - tox -e $TOX_ENV
-  # stop the build if there are Python syntax errors or undefined names
-  - flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
-  # exit-zero treats all errors as warnings.  The GitHub editor is 127 chars wide
-  - flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+  - python -m pyflakes.__main__ $(git ls-files | grep -E "^isso/.+.py$" | grep -v "^isso/compat.py")
 notifications:
   irc:
     channels: