diff --git a/swift/common/middleware/s3api/s3api.py b/swift/common/middleware/s3api/s3api.py
index 42cef6024d..9c225c53b9 100644
--- a/swift/common/middleware/s3api/s3api.py
+++ b/swift/common/middleware/s3api/s3api.py
@@ -452,13 +452,15 @@ def filter_factory(global_conf, **local_conf):
     register_swift_info(
         's3api',
         # TODO: make default values as variables
-        max_bucket_listing=conf.get('max_bucket_listing', 1000),
-        max_parts_listing=conf.get('max_parts_listing', 1000),
-        max_upload_part_num=conf.get('max_upload_part_num', 1000),
-        max_multi_delete_objects=conf.get('max_multi_delete_objects', 1000),
-        allow_multipart_uploads=conf.get('allow_multipart_uploads', True),
-        min_segment_size=conf.get('min_segment_size', 5242880),
-        s3_acl=conf.get('s3_acl', False)
+        max_bucket_listing=int(conf.get('max_bucket_listing', 1000)),
+        max_parts_listing=int(conf.get('max_parts_listing', 1000)),
+        max_upload_part_num=int(conf.get('max_upload_part_num', 1000)),
+        max_multi_delete_objects=int(
+            conf.get('max_multi_delete_objects', 1000)),
+        allow_multipart_uploads=config_true_value(
+            conf.get('allow_multipart_uploads', True)),
+        min_segment_size=int(conf.get('min_segment_size', 5242880)),
+        s3_acl=config_true_value(conf.get('s3_acl', False)),
     )
 
     def s3api_filter(app):
diff --git a/test/unit/common/middleware/s3api/test_s3api.py b/test/unit/common/middleware/s3api/test_s3api.py
index 81db1edd90..57a2cde6e6 100644
--- a/test/unit/common/middleware/s3api/test_s3api.py
+++ b/test/unit/common/middleware/s3api/test_s3api.py
@@ -868,7 +868,8 @@ class TestS3ApiMiddleware(S3ApiTestCase):
         self.assertEqual(elem.find('./ResourceType').text, 'ACL')
 
     def test_registered_defaults(self):
-        filter_factory(self.conf)
+        conf_from_file = {k: str(v) for k, v in self.conf.items()}
+        filter_factory(conf_from_file)
         swift_info = utils.get_swift_info()
         self.assertTrue('s3api' in swift_info)
         self.assertEqual(swift_info['s3api'].get('max_bucket_listing'),