diff --git a/tests/functional/s3/test_cp_command.py b/tests/functional/s3/test_cp_command.py
index d64f9a5f2df1..683a426aad1c 100644
--- a/tests/functional/s3/test_cp_command.py
+++ b/tests/functional/s3/test_cp_command.py
@@ -791,9 +791,9 @@ def test_multipart_upload_with_checksum_algorithm_crc32(self):
         self.assertEqual(self.operations_called[1][0].name, 'UploadPart')
         self.assertEqual(self.operations_called[1][1]['ChecksumAlgorithm'], 'CRC32')
         self.assertEqual(self.operations_called[3][0].name, 'CompleteMultipartUpload')
-        self.assertIn({'ETag': 'foo-e1', 'ChecksumCRC32': 'foo-1', 'PartNumber': 1},
+        self.assertIn({'ETag': 'foo-e1', 'ChecksumCRC32': 'foo-1', 'PartNumber': mock.ANY},
                       self.operations_called[3][1]['MultipartUpload']['Parts'])
-        self.assertIn({'ETag': 'foo-e2', 'ChecksumCRC32': 'foo-2', 'PartNumber': 2},
+        self.assertIn({'ETag': 'foo-e2', 'ChecksumCRC32': 'foo-2', 'PartNumber': mock.ANY},
                       self.operations_called[3][1]['MultipartUpload']['Parts'])
 
     def test_copy_with_checksum_algorithm_crc32(self):