diff --git a/src/lib/app.ts b/src/lib/app.ts
index 93a0399b9..0fb01c2a1 100644
--- a/src/lib/app.ts
+++ b/src/lib/app.ts
@@ -63,6 +63,13 @@ if (config.useSSL) {
   server = http.createServer(app)
 }
 
+// if we manage to provide HTTPS domains, but don't provide TLS ourselves
+// obviously a proxy is involded. In order to make sure express is aware of
+// this, we provide the option to trust proxies here.
+if (!config.useSSL && config.protocolUseSSL) {
+  app.set('trust proxy', 1)
+}
+
 // socket io
 const io = SocketIO(server, { cookie: false })
 io.engine.ws = new WebSocket.Server({