diff --git a/syncevolution-1.5.3-python3-b.patch b/syncevolution-1.5.3-python3-b.patch
new file mode 100644
index 0000000..0372fd3
--- /dev/null
+++ b/syncevolution-1.5.3-python3-b.patch
@@ -0,0 +1,66 @@
+diff -up syncevolution-1.5.3/test/syncevo-http-server.py.python3-2 syncevolution-1.5.3/test/syncevo-http-server.py
+--- syncevolution-1.5.3/test/syncevo-http-server.py.python3-2	2020-05-11 12:10:50.479969706 +0200
++++ syncevolution-1.5.3/test/syncevo-http-server.py	2020-05-11 12:12:43.627963000 +0200
+@@ -131,7 +131,7 @@ class SyncMLSession:
+         then remove the session'''
+         logger.debug("destructing connection %s with code %s message %s", self.conpath, code, message)
+         if self.request:
+-            self.request.setResponseCode(code, message)
++            self.request.setResponseCode(code, message.encode())
+             self.request.finish()
+             self.request = None
+         if self.connection:
+@@ -179,7 +179,7 @@ class SyncMLSession:
+             OldRequest.type = type
+             if request:
+                 request.setHeader('Content-Type', type)
+-                request.setHeader('Content-Length', len(data))
++                request.setHeader('Content-Length', str(len(data)))
+                 request.setResponseCode(http.OK)
+                 request.write(data)
+                 request.finish()
+@@ -243,7 +243,6 @@ class SyncMLSession:
+                                         'org.syncevolution',
+                                         self.conpath,
+                                         path_keyword='conpath',
+-                                        utf8_strings=True,
+                                         byte_arrays=True)
+         self.reply_match = \
+         Context.bus.add_signal_receiver(self.reply,
+@@ -252,7 +251,6 @@ class SyncMLSession:
+                                         'org.syncevolution',
+                                         self.conpath,
+                                         path_keyword='conpath',
+-                                        utf8_strings=True,
+                                         byte_arrays=True)
+ 
+         # feed new data into SyncEvolution and wait for reply
+@@ -319,16 +317,16 @@ class SyncMLPost(resource.Resource):
+             config = ""
+         type = request.getHeader('content-type')
+         len = request.getHeader('content-length')
+-        sessionid = request.args.get('sessionid')
++        sessionid = request.args.get(b'sessionid')
+         if sessionid:
+-            sessionid = sessionid[0]
++            sessionid = sessionid[0].decode()
+         logger.debug("POST from %s config %s type %s session %s args %s length %s",
+                      request.getClientIP(), config, type, sessionid, request.args, len)
+         if not sessionid:
+             logger.info("new SyncML session for %s", request.getClientIP())
+             session = SyncMLSession()
+             session.start(request, config,
+-                          urllib.parse.urljoin(self.url.geturl(), request.path))
++                          urllib.parse.urljoin(self.url.geturl(), request.path.decode()))
+             return server.NOT_DONE_YET
+         else:
+             data = request.content.read()
+@@ -587,7 +585,7 @@ syncevo-http-server itself is installed"
+ 
+     url = urllib.parse.urlparse(args[0])
+     root = resource.Resource()
+-    root.putChild(url.path[1:], SyncMLPost(url))
++    root.putChild(url.path[1:].encode(), SyncMLPost(url))
+     site = server.Site(root)
+     if url.scheme == "https":
+         if not options.cert:
diff --git a/syncevolution.spec b/syncevolution.spec
index a005a31..6f8759b 100644
--- a/syncevolution.spec
+++ b/syncevolution.spec
@@ -2,7 +2,7 @@ Summary:       SyncML client for evolution
 Name:          syncevolution
 Epoch:         1
 Version:       1.5.3
-Release:       11%{?dist}
+Release:       12%{?dist}
 License:       LGPLv2+
 URL:           http://syncevolution.org/
 Source:        http://downloads.syncevolution.org/%{name}/sources/%{name}-%{version}.tar.gz
@@ -12,6 +12,7 @@ Patch1:        syncevolution-1.5.1-libical2.patch
 Patch2:        syncevolution-1.5.3-eds-libecal-2.0.patch
 Patch3:        syncevolution-1.5.3-python3.patch
 Patch4:        syncevolution-1.5.3-eds-libecal-2.0-b.patch
+Patch5:        syncevolution-1.5.3-python3-b.patch
 
 BuildRequires: pkgconfig(dbus-glib-1)
 
@@ -99,6 +100,7 @@ Akonadi backend for %{name}.
 %patch2 -p1 -b .eds-libecal-2.0
 %patch3 -p1 -b .python3
 %patch4 -p1 -b .eds-libecal-2.0-b
+%patch5 -p1 -b .python3-b
 
 # use the ac macros in Makefile.am
 sed -i '/^ACLOCAL_AMFLAGS/{ /m4-repo/!s/$/ -I m4-repo/ }' Makefile*.am
@@ -199,6 +201,9 @@ desktop-file-validate %{buildroot}/%{_datadir}/applications/sync.desktop
 %{_datadir}/syncevolution/xml/*.pl
 
 %changelog
+* Mon May 11 2020 Milan Crha <mcrha@redhat.com> - 1:1.5.3-12
+- Add patch by David Hampton to correct python3 conversion (RH bug #1833578)
+
 * Fri Jan 31 2020 Fedora Release Engineering <releng@fedoraproject.org> - 1:1.5.3-11
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild