diff --git a/tests/test_gcloud.py b/tests/test_gcloud.py
index 758c66e4e..eec346097 100644
--- a/tests/test_gcloud.py
+++ b/tests/test_gcloud.py
@@ -40,7 +40,7 @@ def test_open_read(self):
         self.storage._client.bucket.assert_called_with(self.bucket_name)
         self.storage._bucket.get_blob.assert_called_with(self.filename, timeout=60)
 
-        f.blob.download_to_file = lambda tmpfile: tmpfile.write(data)
+        f.blob.download_to_file = lambda tmpfile, **kwargs: tmpfile.write(data)
         self.assertEqual(f.read(), data)
 
     def test_open_read_num_bytes(self):
@@ -51,7 +51,7 @@ def test_open_read_num_bytes(self):
         self.storage._client.bucket.assert_called_with(self.bucket_name)
         self.storage._bucket.get_blob.assert_called_with(self.filename, timeout=60)
 
-        f.blob.download_to_file = lambda tmpfile: tmpfile.write(data)
+        f.blob.download_to_file = lambda tmpfile, **kwargs: tmpfile.write(data)
         self.assertEqual(f.read(num_bytes), data[0:num_bytes])
 
     def test_open_read_nonexistent(self):