diff --git a/cloudinit/net/sysconfig.py b/cloudinit/net/sysconfig.py
index ba85584e183..99a4bae4597 100644
--- a/cloudinit/net/sysconfig.py
+++ b/cloudinit/net/sysconfig.py
@@ -402,6 +402,7 @@ def _render_subnets(cls, iface_cfg, subnets, has_default_route, flavor):
                     iface_cfg['BOOTPROTO'] = 'dhcp'
                     iface_cfg['DHCPV6C'] = True
                     iface_cfg['IPV6INIT'] = True
+                    iface_cfg['IPV6_AUTOCONF'] = False
                 else:
                     iface_cfg['IPV6INIT'] = True
                     # Configure network settings using DHCPv6
diff --git a/tests/unittests/test_net.py b/tests/unittests/test_net.py
index 8b34e0c9724..bf0cdabb4d6 100644
--- a/tests/unittests/test_net.py
+++ b/tests/unittests/test_net.py
@@ -1369,6 +1369,7 @@
             DEVICE=iface0
             DHCPV6C=yes
             IPV6INIT=yes
+            IPV6_AUTOCONF=no
             IPV6_FORCE_ACCEPT_RA=yes
             DEVICE=iface0
             NM_CONTROLLED=no