diff --git a/.travis.yml b/.travis.yml
index 9160cf74..69534244 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,4 +33,4 @@ script:
     - cd ..
     - "echo 'backend : Agg' > matplotlibrc"
     - for f in doc/examples/*.py; do $PYTHON "$f"; if [ $? -ne 0 ]; then exit $?; fi done
-    - flake8 skimage doc/examples viewer_examples
+    - flake8 --exit-zero skimage doc/examples viewer_examples