diff --git a/types/index.d.ts b/types/index.d.ts
index 7edaac1..992a00e 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -2,6 +2,7 @@
 
 import {
   FastifyPluginCallback,
+  FastifyReply,
   FastifyRequest,
   preHandlerHookHandler,
   preValidationHookHandler,
@@ -17,6 +18,28 @@ import {
 import { ClientOptions, ServerOptions, WebSocket } from 'ws'
 import { Logger } from 'pino'
 
+type FastifyReplyWithFromParameters = FastifyReply & {
+  fromParameters: (
+    url: string,
+    params?: unknown,
+    prefix?: string
+  ) => { url: string; options: unknown };
+}
+
+type ProxyPreHandlerHookHandler = (
+  this: preHandlerHookHandler,
+  request: Parameters<preHandlerHookHandler>[0],
+  reply: FastifyReplyWithFromParameters,
+  done: Parameters<preHandlerHookHandler>[2]
+) => void
+
+type ProxyPreValidationHookHandler = (
+  this: preValidationHookHandler,
+  request: Parameters<preValidationHookHandler>[0],
+  reply: FastifyReplyWithFromParameters,
+  done: Parameters<preValidationHookHandler>[2]
+) => void
+
 interface WebSocketHooks {
   onConnect?: (context: { log: Logger }, source: WebSocket, target: WebSocket) => void;
   onDisconnect?: (context: { log: Logger }, source: WebSocket) => void;
@@ -42,6 +65,7 @@ interface FastifyHttpProxyWebsocketOptionsEnabled {
   wsHooks?: WebSocketHooks;
   wsReconnect?: WebSocketReconnectOptions;
 }
+
 interface FastifyHttpProxyWebsocketOptionsDisabled {
   websocket?: false | never;
   wsUpstream?: never;
@@ -64,9 +88,9 @@ declare namespace fastifyHttpProxy {
     prefix?: string;
     rewritePrefix?: string;
     proxyPayloads?: boolean;
-    preHandler?: preHandlerHookHandler;
-    beforeHandler?: preHandlerHookHandler;
-    preValidation?: preValidationHookHandler;
+    preHandler?: ProxyPreHandlerHookHandler;
+    beforeHandler?: ProxyPreHandlerHookHandler;
+    preValidation?: ProxyPreValidationHookHandler;
     config?: Object;
     replyOptions?: FastifyReplyFromHooks;
     wsClientOptions?: ClientOptions & { queryString?: { [key: string]: unknown } | QueryStringFunction; };
diff --git a/types/index.test-d.ts b/types/index.test-d.ts
index 5106bed..3b044cd 100644
--- a/types/index.test-d.ts
+++ b/types/index.test-d.ts
@@ -25,14 +25,21 @@ app.register(fastifyHttpProxy, {
   preHandler: (request, reply) => {
     expectType<RawRequestDefaultExpression>(request.raw)
     expectType<RawReplyDefaultExpression>(reply.raw)
+    expectType<(url: string, params?: unknown, prefix?: string) => { url: string; options: unknown }>(reply.fromParameters)
   },
   beforeHandler: (request, reply) => {
     expectType<RawRequestDefaultExpression>(request.raw)
     expectType<RawReplyDefaultExpression>(reply.raw)
+    expectType<(url: string, params?: unknown, prefix?: string) => { url: string; options: unknown }>(reply.fromParameters)
   },
   preValidation: (request, reply) => {
     expectType<RawRequestDefaultExpression>(request.raw)
     expectType<RawReplyDefaultExpression>(reply.raw)
+    expectType<(url: string, params?: unknown, prefix?: string) => { url: string; options: unknown }>(reply.fromParameters)
+
+    const result = reply.fromParameters('/')
+    expectType<unknown>(result.options)
+    expectType<string>(result.url)
   },
   base: 'whatever',
   cacheURLs: 10,