diff --git a/src/interface.ts b/src/interface.ts
index c22230f..160b593 100644
--- a/src/interface.ts
+++ b/src/interface.ts
@@ -1,14 +1,19 @@
 import * as radius from 'radius';
 import * as gblConfig from '../config';
 import { IPacket } from './types/PacketHandler';
-import {Authentication} from "./auth";
-import {UDPServer} from "./server/UDPServer";
-import {RadiusService} from "./radius/RadiusService";
-
-export type PacketDecoder = (msg: Buffer) => {
-	packet?: radius.RadiusPacket & IPacket;
-	secret: string;
-};
+import { Authentication } from './auth';
+import { UDPServer } from './server/UDPServer';
+import { RadiusService } from './radius/RadiusService';
+
+export type PacketDecoder = (msg: Buffer) =>
+	| {
+			packet?: radius.RadiusPacket & IPacket;
+			secret: string;
+	  }
+	| Promise<{
+			packet?: radius.RadiusPacket & IPacket;
+			secret: string;
+	  }>;
 
 export default class PackageInterface {
 	private static _instance?: PackageInterface;
diff --git a/src/radius/RadiusService.ts b/src/radius/RadiusService.ts
index 9ddfaf3..70a57d4 100644
--- a/src/radius/RadiusService.ts
+++ b/src/radius/RadiusService.ts
@@ -27,7 +27,7 @@ export class RadiusService {
 		msg: Buffer
 	): Promise<{ data: Buffer; expectAcknowledgment?: boolean } | undefined> {
 		const { packet, secret } = packageInterface.packetDecoder
-			? packageInterface.packetDecoder(msg)
+			? await packageInterface.packetDecoder(msg)
 			: this.defaultDecoder(msg);
 
 		if (!packet) {