diff --git a/0001-Improved-test-for-SQLITE_DETERMINISTIC.patch b/0001-Improved-test-for-SQLITE_DETERMINISTIC.patch
new file mode 100644
index 0000000..e383b65
--- /dev/null
+++ b/0001-Improved-test-for-SQLITE_DETERMINISTIC.patch
@@ -0,0 +1,30 @@
+From e19b2f2ac49d5daa7c6e0bde54441d0fa417ec7c Mon Sep 17 00:00:00 2001
+From: Roger Binns <rogerb@rogerbinns.com>
+Date: Wed, 27 May 2020 14:50:13 -0700
+Subject: [PATCH] Improved test for SQLITE_DETERMINISTIC
+
+https://sqlite.org/forum/forumpost/552e8e236a
+---
+ tests.py | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/tests.py b/tests.py
+index 46c0da6..374a33c 100644
+--- a/tests.py
++++ b/tests.py
+@@ -1322,9 +1322,11 @@ class APSW(unittest.TestCase):
+         self.db.createscalarfunction("nondeterministic", Counter(), deterministic=False)
+         self.db.createscalarfunction("unspecdeterministic", Counter())
+ 
+-        self.assertEqual(c.execute("select deterministic()=deterministic()").fetchall()[0][0], 1)
++        # only deterministic can be used for indices
++        c.execute("create table td(a,b); create index tda on td(a) where deterministic()")
+         self.assertEqual(c.execute("select nondeterministic()=nondeterministic()").fetchall()[0][0], 0)
+         self.assertEqual(c.execute("select unspecdeterministic()=unspecdeterministic()").fetchall()[0][0], 0)
++        self.assertRaises(apsw.SQLError, c.execute, "create index tdb on td(b) where nondeterministic()")
+ 
+     def testAggregateFunctions(self):
+         "Verify aggregate functions"
+-- 
+2.26.2
+
diff --git a/python-apsw.spec b/python-apsw.spec
index b2e7b71..ee6fc7f 100644
--- a/python-apsw.spec
+++ b/python-apsw.spec
@@ -26,11 +26,14 @@
 
 Name:               python-apsw
 Version:            %{real_version}
-Release:            2%{?dist}
+Release:            3%{?dist}
 Summary:            Another Python SQLite Wrapper
 License:            zlib
 URL:                https://github.com/rogerbinns/apsw
 Source:             https://github.com/rogerbinns/apsw/releases/download/%{pkg_version}/apsw-%{pkg_version}.zip
+# https://github.com/rogerbinns/apsw/commit/e19b2f2ac49d5daa7c6e0bde54441d0fa417ec7c
+# Fixes build with Python 3.9
+Patch0:             0001-Improved-test-for-SQLITE_DETERMINISTIC.patch
 
 BuildRequires:      gcc
 BuildRequires:      python%{python3_pkgversion}-devel
@@ -74,6 +77,9 @@ PYTHONPATH=%{buildroot}%{python3_sitearch} %{__python3} setup.py test
 
 
 %changelog
+* Fri May 29 2020 Adam Williamson <awilliam@redhat.com> - 3.31.1.r1-3
+- Backport upstream test improvement to fix build with Python 3.9
+
 * Tue May 26 2020 Miro Hrončok <mhroncok@redhat.com> - 3.31.1.r1-2
 - Rebuilt for Python 3.9