diff --git a/internal/dnsforward/beforerequest_internal_test.go b/internal/dnsforward/beforerequest_internal_test.go
index 832f349269d..7e0d6e9b939 100644
--- a/internal/dnsforward/beforerequest_internal_test.go
+++ b/internal/dnsforward/beforerequest_internal_test.go
@@ -260,20 +260,16 @@ func TestServer_HandleBefore_udp(t *testing.T) {
 				UDPListenAddrs: []*net.UDPAddr{{}},
 				TCPListenAddrs: []*net.TCPAddr{{}},
 				Config: Config{
-					UpstreamDNS:      []string{localUpsAddr},
-					UpstreamMode:     UpstreamModeLoadBalance,
-					EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
+					AllowedClients:    tc.allowedClients,
+					DisallowedClients: tc.disallowedClients,
+					BlockedHosts:      tc.blockedHosts,
+					UpstreamDNS:       []string{localUpsAddr},
+					UpstreamMode:      UpstreamModeLoadBalance,
+					EDNSClientSubnet:  &EDNSClientSubnet{Enabled: false},
 				},
 				ServePlainDNS: true,
 			})
 
-			s.conf.AllowedClients = tc.allowedClients
-			s.conf.DisallowedClients = tc.disallowedClients
-			s.conf.BlockedHosts = tc.blockedHosts
-
-			err := s.Prepare(&s.conf)
-			require.NoError(t, err)
-
 			startDeferStop(t, s)
 
 			client := &dns.Client{