diff --git a/src/browser/starter.js b/src/browser/starter.js
index 528a81bb63..80dfea5479 100644
--- a/src/browser/starter.js
+++ b/src/browser/starter.js
@@ -311,9 +311,12 @@ V86.prototype.continue_init = async function(emulator, options)
     if(relay_url)
     {
         // TODO: remove bus, use direct calls instead
-        if(relay_url === "fetch")
-        {
-            this.network_adapter = new FetchNetworkAdapter(this.bus);
+        if(relay_url.startsWith("fetch")) {
+            const fetch_options = {};
+            if(relay_url.length > 6 && relay_url[5] === ":") {
+                fetch_options.cors_proxy = relay_url.slice(6);
+            }
+            this.network_adapter = new FetchNetworkAdapter(this.bus, fetch_options);
         }
         else if(relay_url.startsWith("wisp://") || relay_url.startsWith("wisps://"))
         {