diff --git a/9e86f6744be764b2522663f9a7fe2376105fc72c.patch b/9e86f6744be764b2522663f9a7fe2376105fc72c.patch
new file mode 100644
index 0000000..ef5b9d6
--- /dev/null
+++ b/9e86f6744be764b2522663f9a7fe2376105fc72c.patch
@@ -0,0 +1,25 @@
+From 9e86f6744be764b2522663f9a7fe2376105fc72c Mon Sep 17 00:00:00 2001
+From: Petr Viktorin <encukou@gmail.com>
+Date: Wed, 21 Aug 2019 14:52:30 +0200
+Subject: [PATCH] py3: When changing a dict, iterate over a copy of its items
+
+Changing dict keys while iterating over the dict was always
+undefined behavior in Python, but in 3.8 our tests started
+failing on this case.
+---
+ src/calibre/ebooks/oeb/base.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/calibre/ebooks/oeb/base.py b/src/calibre/ebooks/oeb/base.py
+index 1f87dcbe45..af9cb3f62a 100644
+--- a/src/calibre/ebooks/oeb/base.py
++++ b/src/calibre/ebooks/oeb/base.py
+@@ -702,7 +702,7 @@ def __init__(self, term, value, attrib={}, nsmap={}, **kwargs):
+                 term = CALIBRE(local)
+             self.term = term
+             self.value = value
+-            for attr, value in attrib.items():
++            for attr, value in list(attrib.items()):
+                 if isprefixname(value):
+                     attrib[attr] = qname(value, nsmap)
+                 nsattr = Metadata.OPF_ATTRS.get(attr, attr)
diff --git a/calibre.spec b/calibre.spec
index 1e72ddc..ca802b4 100644
--- a/calibre.spec
+++ b/calibre.spec
@@ -106,6 +106,8 @@ Patch10069:     0069-Update-bundled-mechanize.patch
 Patch10070:     0070-Get-parse_index-working-for-foreign-affairs-AJAX-bac.patch
 Patch10071:     0071-Update-Foreign-Affairs.patch
 
+Patch20001:     https://github.com/kovidgoyal/calibre/pull/1033/commits/9e86f6744be764b2522663f9a7fe2376105fc72c.patch
+
 BuildRequires:  python3-devel
 BuildRequires:  python3-setuptools
 BuildRequires:  python3-qt5-devel