diff --git a/dns.go b/dns.go
index df896090..8ecd993c 100644
--- a/dns.go
+++ b/dns.go
@@ -51,7 +51,12 @@ func generateMagicDNSRootDomains(ipPrefixes []netaddr.IPPrefix) []dnsname.FQDN {
 			generateDNSRoot = generateIPv6DNSRootDomain
 
 		default:
-			panic(fmt.Sprintf("unsupported IP version with address length %d", ipPrefix.IP().BitLen()))
+			panic(
+				fmt.Sprintf(
+					"unsupported IP version with address length %d",
+					ipPrefix.IP().BitLen(),
+				),
+			)
 		}
 
 		fqdns = append(fqdns, generateDNSRoot(ipPrefix)...)
@@ -115,7 +120,9 @@ func generateIPv6DNSRootDomain(ipPrefix netaddr.IPPrefix) []dnsname.FQDN {
 	// function is called only once over the lifetime of a server process.
 	prefixConstantParts := []string{}
 	for i := 0; i < maskBits/nibbleLen; i++ {
-		prefixConstantParts = append([]string{string(nibbleStr[i])}, prefixConstantParts...)
+		prefixConstantParts = append(
+			[]string{string(nibbleStr[i])},
+			prefixConstantParts...)
 	}
 
 	makeDomain := func(variablePrefix ...string) (dnsname.FQDN, error) {
diff --git a/dns_test.go b/dns_test.go
index f8f7fb96..80ee83bb 100644
--- a/dns_test.go
+++ b/dns_test.go
@@ -81,7 +81,11 @@ func (s *Suite) TestMagicDNSRootDomainsIPv6Single(c *check.C) {
 	domains := generateMagicDNSRootDomains(prefixes)
 
 	c.Assert(len(domains), check.Equals, 1)
-	c.Assert(domains[0].WithTrailingDot(), check.Equals, "0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa.")
+	c.Assert(
+		domains[0].WithTrailingDot(),
+		check.Equals,
+		"0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa.",
+	)
 }
 
 func (s *Suite) TestMagicDNSRootDomainsIPv6SingleMultiple(c *check.C) {