diff --git a/index.js b/index.js
index 8db4eca3..d68f8faf 100644
--- a/index.js
+++ b/index.js
@@ -607,6 +607,10 @@ function issecure(req, trustProxy) {
     return false;
   }
 
+  if (req.headers['x-arr-ssl']) {
+    return true;
+  }
+
   // no explicit trust; try req.secure from express
   if (trustProxy !== true) {
     var secure = req.secure;