From 9a1e55153b6f0a2073bd1c9103c9da6717dc63db Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 4 Sep 2019 08:53:34 +0530
Subject: [PATCH] ...

---
 src/calibre/ebooks/pdf/html_writer.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/pdf/html_writer.py b/src/calibre/ebooks/pdf/html_writer.py
index 526c849753..dd8c58c723 100644
--- a/src/calibre/ebooks/pdf/html_writer.py
+++ b/src/calibre/ebooks/pdf/html_writer.py
@@ -208,7 +208,9 @@ class RenderManager(QObject):
         self.opts = opts
         self.workers = []
         self.max_workers = detect_ncpus()
-        if not iswindows:
+        if iswindows:
+            self.original_signal_handlers = {}
+        else:
             self.original_signal_handlers = setup_unix_signals(self)
 
     def create_worker(self):