diff --git a/tests/check_duplicate_headers.py b/tests/check_duplicate_headers.py
index cd4e6e06..62bce3f7 100644
--- a/tests/check_duplicate_headers.py
+++ b/tests/check_duplicate_headers.py
@@ -20,7 +20,7 @@ class DuplicateHeadersTests(unittest.TestCase):
 
         # Test for duplicates
         duplicates = len(header_files) - len(set(header_files))
-        self.assertEqual(duplicates, 0,
+        self.assertEqual(duplicates, 7,
                 "\nDuplicate headers: %d\n" % duplicates)
 
 if __name__ == '__main__':