diff --git a/cloudinit/net/sysconfig.py b/cloudinit/net/sysconfig.py
index 94801a9..1793977 100644
--- a/cloudinit/net/sysconfig.py
+++ b/cloudinit/net/sysconfig.py
@@ -397,6 +397,7 @@ class Renderer(renderer.Renderer):
                     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 bcd261d..844d5ba 100644
--- a/tests/unittests/test_net.py
+++ b/tests/unittests/test_net.py
@@ -1363,6 +1363,7 @@ NETWORK_CONFIGS = {
             DEVICE=iface0
             DHCPV6C=yes
             IPV6INIT=yes
+            IPV6_AUTOCONF=no
             IPV6_FORCE_ACCEPT_RA=yes
             DEVICE=iface0
             NM_CONTROLLED=no