diff --git a/.travis.yml b/.travis.yml
index a8df432e..f4f95d67 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: python
 python:
   - "2.7"
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"
@@ -10,9 +9,15 @@ python:
   - "nightly"
 install:
   - "pip install -e ."
+  - "pip install flake8"
   - "pip install pycrypto>=2.6"
   - "pip install -q behave"
-# command to run tests
+# commands to run tests
+before_script:
+  # 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
 script:
  - python --version
  - behave