From 4272c4e35c86ae2243e3374b97bf417e00a4c139 Mon Sep 17 00:00:00 2001
From: Plom Heller <plom@plomlompom.com>
Date: Fri, 10 Apr 2026 02:28:58 +0200
Subject: [PATCH] Fix mis-calculation of spine cut positions on -n.

---
 bookmaker.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bookmaker.py b/bookmaker.py
index cfdf5c5..7b45832 100755
--- a/bookmaker.py
+++ b/bookmaker.py
@@ -256,7 +256,7 @@ class Nup4Geometry:
         self.shrink_for_margin = (A4_WIDTH - 2 * self.margin)/A4_WIDTH
         # NB: We define spine size un-shrunk, but .shrink_for_spine is used
         # with values shrunk for the margin, which we undo here.
-        spine_part_of_page = ((INNER_SPINE_MARGIN_PER_PAGE / A4_WIDTH/2)
+        spine_part_of_page = ((INNER_SPINE_MARGIN_PER_PAGE / (A4_WIDTH/2))
                               / self.shrink_for_margin)
         self.shrink_for_spine = 1 - spine_part_of_page
 
-- 
2.30.2