diff --git a/setup.cfg b/setup.cfg
index beed723..f8e4ce7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -6,3 +6,7 @@ dev = develop easy_install nti.externalization[test]
 
 [bdist_wheel]
 universal = 0
+
+[check-manifest]
+ignore =
+    *.c
diff --git a/setup.py b/setup.py
index 26686d7..e7bda6b 100755
--- a/setup.py
+++ b/setup.py
@@ -183,7 +183,7 @@ def _c(m):
         'zope.security',
     ],
     extras_require={
-       'test': TESTS_REQUIRE,
+        'test': TESTS_REQUIRE,
         'docs': [
             'Sphinx',
             'repoze.sphinx.autointerface',
@@ -192,7 +192,6 @@ def _c(m):
         'benchmarks': [
             'perf',
         ],
-
     },
     entry_points=entry_points,
 )