diff --git a/src/_zkapauthorizer/tests/test_storage_protocol.py b/src/_zkapauthorizer/tests/test_storage_protocol.py
index c4d9d8403aefc8589b48f57edea191d1cef1bddc..ea5c71c01221fa90f7b07ce807bfffdd33710f3d 100644
--- a/src/_zkapauthorizer/tests/test_storage_protocol.py
+++ b/src/_zkapauthorizer/tests/test_storage_protocol.py
@@ -440,6 +440,7 @@ class ShareTests(TestCase):
             ),
         )
 
+    @skipIf(platform.isWindows(), "Creating large files on Windows (no sparse files) is too slow")
     @given(
         storage_index=storage_indexes(),
         sharenum=sharenums(),
@@ -629,7 +630,7 @@ class ShareTests(TestCase):
     )
     def test_create_mutable(self, storage_index, secrets, test_and_write_vectors_for_shares):
         """
-        Mutable share data written using *slot_testv_and_readv_and_writev* can be
+        Mutable share data written using *slot_testv_and_readv_abbnd_writev* can be
         read back as-written and without spending any more passes.
         """
         # Hypothesis causes our storage server to be used many times.  Clean