diff --git a/plugins/proxy-backend/report.api.md b/plugins/proxy-backend/report.api.md
index ef0fe37c96..90e7f54378 100644
--- a/plugins/proxy-backend/report.api.md
+++ b/plugins/proxy-backend/report.api.md
@@ -6,8 +6,8 @@
 import { BackendFeature } from '@backstage/backend-plugin-api';
 import { DiscoveryService } from '@backstage/backend-plugin-api';
 import express from 'express';
-import { JsonObject } from '@backstage/types';
 import { Logger } from 'winston';
+import { ProxyConfig } from '@backstage/plugin-proxy-node/alpha';
 import { RootConfigService } from '@backstage/backend-plugin-api';
 
 // @public @deprecated
@@ -20,7 +20,7 @@ export default proxyPlugin;
 // @public @deprecated (undocumented)
 export interface RouterOptions {
   // (undocumented)
-  additionalEndpoints?: JsonObject;
+  additionalEndpoints?: ProxyConfig;
   // (undocumented)
   config: RootConfigService;
   // (undocumented)
diff --git a/plugins/proxy-backend/src/service/router.ts b/plugins/proxy-backend/src/service/router.ts
index b578a9aed6..934b1fcecb 100644
--- a/plugins/proxy-backend/src/service/router.ts
+++ b/plugins/proxy-backend/src/service/router.ts
@@ -63,7 +63,7 @@ export interface RouterOptions {
   discovery: DiscoveryService;
   skipInvalidProxies?: boolean;
   reviveConsumedRequestBodies?: boolean;
-  additionalEndpoints?: JsonObject;
+  additionalEndpoints?: ProxyConfig;
 }
 
 // Creates a proxy middleware, possibly with defaults added on top of the
@@ -310,10 +310,11 @@ export async function createRouterInternal(
   const externalUrl = await options.discovery.getExternalBaseUrl('proxy');
   const { pathname: pathPrefix } = new URL(externalUrl);
 
-  const proxyConfig = {
+  const proxyConfig: ProxyConfig = {
     ...(options.additionalEndpoints ?? {}),
     ...readProxyConfig(options.config, options.logger),
   };
+
   configureMiddlewares(
     proxyOptions,
     currentRouter,
@@ -356,10 +357,10 @@ function configureMiddlewares(
   },
   router: express.Router,
   pathPrefix: string,
-  proxyConfig: any,
+  proxyConfig: ProxyConfig,
   httpRouterService?: HttpRouterService,
 ) {
-  Object.entries<any>(proxyConfig).forEach(([route, proxyRouteConfig]) => {
+  Object.entries(proxyConfig).forEach(([route, proxyRouteConfig]) => {
     try {
       router.use(
         route,