diff --git a/contrib/import-checker.py b/contrib/import-checker.py
--- a/contrib/import-checker.py
+++ b/contrib/import-checker.py
@@ -90,7 +90,8 @@ def list_stdlib_modules():
             for name in files:
                 if name == '__init__.py':
                     continue
-                if not (name.endswith('.py') or name.endswith('.so')):
+                if not (name.endswith('.py') or name.endswith('.so')
+                        or name.endswith('.pyd')):
                     continue
                 full_path = os.path.join(top, name)
                 if 'site-packages' in full_path: