diff --git a/src/calibre/startup.py b/src/calibre/startup.py
index 9d5c4b51fc..c202104d77 100644
--- a/src/calibre/startup.py
+++ b/src/calibre/startup.py
@@ -139,6 +139,7 @@ if not _run_once:
             flags |= os.O_NOINHERIT
             fd = os.open(name, flags)
             ans = os.fdopen(fd, mode, bufsize)
+            ans.name = name
         else:
             import fcntl
             try: