diff --git a/.travis.yml b/.travis.yml
index bab78128..354f2c61 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,9 +3,8 @@ python:
   - "2.7"
 # command to install dependencies
 install:
-  - "python setup.py -q install"
-  - "pip install python-coveralls"
-  - "pip install pytest-cov"
+  - python setup.py -q install
+  - pip install coverage pytest-cov coveralls --use-mirrors
 # command to run tests
 #script: nosetests --with-doctest
 #script: py.test run-tests.py ./pywb/ --doctest-modules --ignore=setup.py
diff --git a/pywb/utils/timeutils.py b/pywb/utils/timeutils.py
index 7af3401f..f93f324d 100644
--- a/pywb/utils/timeutils.py
+++ b/pywb/utils/timeutils.py
@@ -162,6 +162,10 @@ def timestamp_to_datetime(string):
     >>> timestamp_to_datetime('40001965252477')
     datetime.datetime(2999, 12, 31, 23, 24, 59)
 
+    # not a number!
+    >>> timestamp_to_datetime('2010abc')
+    datetime.datetime(2010, 12, 31, 23, 59, 59)
+
     """
 
     # pad to 6 digits