diff --git a/src/client.ts b/src/client.ts
index 05a5e2b..37bf3aa 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -6,8 +6,8 @@ import { MISSING_API_KEY_ERROR_MESSAGE, PORTKEY_BASE_URL } from "./constants";
 import { castToError, readEnv } from "./utils";
 
 export class Portkey extends ApiClient {
-	override apiKey: string | null;
-	override baseURL: string;
+	declare apiKey: string | null;
+	declare baseURL: string;
 	virtualKey: string | null;
 	config: Record<string, unknown> | string | null | undefined;
 	provider: string | null | undefined;