diff --git a/qubesagent/firewall.py b/qubesagent/firewall.py
index ca89f38..5443dc0 100755
--- a/qubesagent/firewall.py
+++ b/qubesagent/firewall.py
@@ -504,7 +504,7 @@ class NftablesWorker(FirewallWorker):
                 action = 'accept'
             elif rule['action'] == 'drop':
                 action = 'reject with icmp{} type admin-prohibited'.format(
-                    '6' if family == 6 else '')
+                    'v6' if family == 6 else '')
             else:
                 raise RuleParseError(
                     'Invalid rule action {}'.format(rule['action']))
diff --git a/qubesagent/test_firewall.py b/qubesagent/test_firewall.py
index 6dddc72..12190c3 100644
--- a/qubesagent/test_firewall.py
+++ b/qubesagent/test_firewall.py
@@ -411,10 +411,10 @@ class TestNftablesWorker(TestCase):
             '    ip6 daddr { 2001::1/128, 2001::2/128 } tcp dport 53 accept\n'
             '    ip6 daddr { 2001::1/128, 2001::2/128 } udp dport 53 accept\n'
             '    ip6 nexthdr udp ip6 daddr { 2001::1/128, 2001::2/128 } '
-            'udp dport 53 reject with icmp6 type admin-prohibited\n'
-            '    ip6 nexthdr icmpv6 icmpv6 type 128 reject with icmp6 type '
+            'udp dport 53 reject with icmpv6 type admin-prohibited\n'
+            '    ip6 nexthdr icmpv6 icmpv6 type 128 reject with icmpv6 type '
             'admin-prohibited\n'
-            '    reject with icmp6 type admin-prohibited\n'
+            '    reject with icmpv6 type admin-prohibited\n'
             '  }\n'
             '}\n'
         )