diff --git a/test/unit/pep8-tests.py b/test/unit/pep8-tests.py
index ba39aad..0d1859f 100644
--- a/test/unit/pep8-tests.py
+++ b/test/unit/pep8-tests.py
@@ -34,6 +34,7 @@ class TestPep8(TitoUnitTestFixture):
             # http://pep8.readthedocs.org/en/latest/intro.html#error-codes
             'E2',    # whitespace errors
             'E3',    # blank line errors
+            'E4',    # import errors
             'E9',    # runtime errors (SyntaxError, IndentationError, IOError)
             'W2',    # whitespace warnings
             'W3',    # blank line warnings