diff --git a/.travis.yml b/.travis.yml
index 3a9cb61..406e470 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,9 +12,9 @@ before_install:
 
 # command to install dependencies
 install:
-  - if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then pip install lxml contextlib2 mock; fi
-  - if [[ $TRAVIS_PYTHON_VERSION == '3.3' ]]; then pip install lxml numpy; fi
-  - if [[ $TRAVIS_PYTHON_VERSION == '3.4' ]]; then pip install lxml numpy; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then pip install lxml contextlib2 mock six; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == '3.3' ]]; then pip install lxml numpy six; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == '3.4' ]]; then pip install lxml numpy six; fi
 
 # command to run tests
 script:
diff --git a/glymur/test/test_glymur_warnings.py b/glymur/test/test_glymur_warnings.py
index fc8b3af..88f1d83 100644
--- a/glymur/test/test_glymur_warnings.py
+++ b/glymur/test/test_glymur_warnings.py
@@ -8,12 +8,13 @@ Test suite for warnings issued by glymur.
 import os
 import re
 import struct
-import six
 import sys
 import tempfile
 import unittest
 import warnings
 
+import six
+
 from glymur import Jp2k
 import glymur