diff --git a/setup/base.go b/setup/base.go
index f8a45409f..0f2c79d7c 100644
--- a/setup/base.go
+++ b/setup/base.go
@@ -297,6 +297,7 @@ func (b *BaseDendrite) CreateAppserviceClient() *gomatrixserverlib.Client {
 	opts := []gomatrixserverlib.ClientOption{
 		gomatrixserverlib.WithSkipVerify(b.Cfg.AppServiceAPI.DisableTLSValidation),
 		gomatrixserverlib.WithTimeout(time.Second * 60),
+		gomatrixserverlib.WithTransport(http.DefaultTransport),
 	}
 	if b.Cfg.Global.DNSCache.Enabled {
 		opts = append(opts, gomatrixserverlib.WithDNSCache(b.DNSCache))