diff --git a/frontend/src/lib/api/client.ts b/frontend/src/lib/api/client.ts
index c644186..f6ff3a7 100644
--- a/frontend/src/lib/api/client.ts
+++ b/frontend/src/lib/api/client.ts
@@ -78,7 +78,8 @@ export async function del<T>(endpoint: string, options?: RequestOptions): Promis
 function buildUrl(endpoint: string, params?: Record<string, string | number | boolean>): string {
   const url = new URL(`${API_BASE_URL}${endpoint}`);
   url.port = window.location.port;
-  
+  url.protocol = window.location.protocol;
+
   if (params) {
     Object.entries(params).forEach(([key, value]) => {
       url.searchParams.append(key, String(value));