diff --git a/src/_secureaccesstokenauthorizer/tests/test_storage_protocol.py b/src/_secureaccesstokenauthorizer/tests/test_storage_protocol.py
index 640f8e16449a2bfd79b00dba9bf97bd9f42b0d56..8e08746333eadb548423bc3839cdd08758e396cd 100644
--- a/src/_secureaccesstokenauthorizer/tests/test_storage_protocol.py
+++ b/src/_secureaccesstokenauthorizer/tests/test_storage_protocol.py
@@ -213,7 +213,7 @@ class ShareTests(TestCase):
         )
 
         for sharenum, bucket in allocated.items():
-            bucket.remote_write(0, bytes_for_share(sharenum, size)),
+            bucket.remote_write(0, bytes_for_share(sharenum, size))
             bucket.remote_close()
 
         readers = extract_result(self.client.get_buckets(storage_index))