diff --git a/src/SlidingSyncManager.ts b/src/SlidingSyncManager.ts
index 4885ffa8dc5..7e17b1ecfe5 100644
--- a/src/SlidingSyncManager.ts
+++ b/src/SlidingSyncManager.ts
@@ -405,7 +405,7 @@ export class SlidingSyncManager {
 
         const proxyUrl = await this.getProxyFromWellKnown(client);
         if (proxyUrl != undefined) {
-            const response = await fetch(new URL("/client/server.json", proxyUrl), {
+            const response = await fetch(new URL("client/server.json", proxyUrl), {
                 method: Method.Get,
                 signal: timeoutSignal(10 * 1000), // 10s
             });