diff --git a/cloud-init-write-routes.patch b/cloud-init-write-routes.patch
index 06d3f8e..348d606 100644
--- a/cloud-init-write-routes.patch
+++ b/cloud-init-write-routes.patch
@@ -1,6 +1,14 @@
 --- cloudinit/distros/opensuse.py.orig
 +++ cloudinit/distros/opensuse.py
-@@ -172,7 +172,48 @@ class Distro(distros.Distro):
+@@ -11,6 +11,7 @@
+ from cloudinit import distros
+ 
+ from cloudinit.distros.parsers.hostname import HostnameConf
++from cloudinit.net.network_state import mask_to_net_prefix
+ 
+ from cloudinit import helpers
+ from cloudinit import log as logging
+@@ -172,7 +173,47 @@ class Distro(distros.Distro):
              util.write_file(out_fn, str(conf), 0o644)
  
      def _write_network_config(self, netconfig):
@@ -29,20 +37,19 @@
 +                    dest = route.get('network')
 +                    if dest in default_nets:
 +                        dest = 'default'
-+                    gateway = route.get('gateway')
-+                    config_routes += ' '.join([dest, gateway])
 +                    if dest != 'default':
-+                        config_routes += ' ' + route.get('netmask', '')
-+                    else:
-+                        config_routes += ' -'
-+                    config_routes += ' -'
-+                    config_routes += '\n'
++                        prefix = mask_to_net_prefix(route.get('netmask'))
++                        dest += '/' + str(prefix)
++                    gateway = route.get('gateway')
++                    config_routes += ' '.join(
++                        [dest, gateway, '-', '-\n']
++                    )
 +                if not config_routes:
 +                    dest = 'default'
 +                    gateway = subnet.get('gateway')
 +                    if gateway:
 +                        config_routes += ' '.join(
-+                            [dest, gateway, '-', '-', '\n']
++                            [dest, gateway, '-', '-\n']
 +                        )
 +            if config_routes:
 +                route_file = '/etc/sysconfig/network/ifroute-%s' % if_name
diff --git a/cloud-init.changes b/cloud-init.changes
index f288ee0..426d2d4 100644
--- a/cloud-init.changes
+++ b/cloud-init.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Wed Nov  6 14:43:54 UTC 2019 - Petr Pavlu <petr.pavlu@suse.com>
+
+- Update cloud-init-write-routes.patch (bsc#1155376)
+  + Write a route's destination network in CIDR notation instead of using the
+    netmask. This provides support for correctly recording IPv6 routes.
+
 -------------------------------------------------------------------
 Tue Oct 22 19:57:22 UTC 2019 - Robert Schweikert <rjschwei@suse.com>
 
diff --git a/cloud-init.spec b/cloud-init.spec
index 3595248..0078244 100644
--- a/cloud-init.spec
+++ b/cloud-init.spec
@@ -49,7 +49,7 @@ Patch50:        cloud-init-noresolv-merge-no-dns-data.diff
 Patch51:        cloud-init-after-wicked.patch
 # FIXME (lp#1849296)
 Patch52:        cloud-init-break-resolv-symlink.patch
-# FIXME (lp#1849378)
+# FIXME (lp#1849378) expected in 19.3
 Patch53:        cloud-init-renderer-detect.patch
 
 BuildRequires:  fdupes