diff --git a/tests/test_stdin.py b/tests/test_stdin.py
index 212b309..2ed346e 100644
--- a/tests/test_stdin.py
+++ b/tests/test_stdin.py
@@ -1,9 +1,17 @@
 """Tests for polyfill's stdin monkey patching."""
 import flake8
-import pep8
-import pycodestyle
 import pytest
 
+try:
+    import pep8
+except ImportError:
+    pep8 = None
+
+try:
+    import pycodestyle
+except ImportError:
+    pycodestyle = None
+
 from flake8_polyfill import stdin
 from flake8_polyfill import version