diff --git a/test/unit/obj/test_diskfile.py b/test/unit/obj/test_diskfile.py
index 22b198edd5..72e227b27d 100644
--- a/test/unit/obj/test_diskfile.py
+++ b/test/unit/obj/test_diskfile.py
@@ -1439,7 +1439,7 @@ class TestDiskFile(unittest.TestCase):
         def mock_handle_close_quarantine():
             raise Exception("Bad")
 
-        df = self._get_open_disk_file(fsize=1024 * 1024 * 2)
+        df = self._get_open_disk_file(fsize=1024 * 1024 * 2, csize=1024)
         reader = df.reader()
         reader._handle_close_quarantine = mock_handle_close_quarantine
         for chunk in reader: