diff --git a/src/middleware/auth/authMiddleware.ts b/src/middleware/auth/authMiddleware.ts
index 47665b0..73f3694 100644
--- a/src/middleware/auth/authMiddleware.ts
+++ b/src/middleware/auth/authMiddleware.ts
@@ -13,11 +13,11 @@ export function initAuthMiddleware(initParams: AuthMiddlewareParams) {
     getHeaders,
     handleAuthError,
   } = initParams;
-  const sanitizedUrl = typeof url === 'function' ? url() : url;
 
   return async (...params: Parameters<MiddlewareHandler>) => {
     const [options, meta] = params;
     const currentSessionTokens = getTokens();
+    const sanitizedUrl = typeof url === 'function' ? await url() : url;
     const headers =
       typeof getHeaders === 'function' ?
         getHeaders(meta) :
diff --git a/src/middleware/auth/types.d.ts b/src/middleware/auth/types.d.ts
index 945db5a..755c3f5 100644
--- a/src/middleware/auth/types.d.ts
+++ b/src/middleware/auth/types.d.ts
@@ -1,5 +1,5 @@
 export interface AuthMiddlewareParams {
-  url: string | (() => string);
+  url: string | (() => Promise<string>);
   method?: RequestInit['method'];
   errorCodes?: Response['status'][];
   getTokens: (tokens?: unknown) => { accessToken: string; refreshToken: string };