diff --git a/packages/grpc-js-xds/interop/Dockerfile b/packages/grpc-js-xds/interop/Dockerfile
index 6239b5f2..9ad6091f 100644
--- a/packages/grpc-js-xds/interop/Dockerfile
+++ b/packages/grpc-js-xds/interop/Dockerfile
@@ -22,6 +22,8 @@ FROM node:18-slim as build
 WORKDIR /node/src/grpc-node
 COPY . .
 
+WORKDIR /node/src/grpc-node/packages/proto-loader
+RUN npm install
 WORKDIR /node/src/grpc-node/packages/grpc-js
 RUN npm install
 WORKDIR /node/src/grpc-node/packages/grpc-js-xds
diff --git a/packages/grpc-js-xds/package.json b/packages/grpc-js-xds/package.json
index 3332a06f..b76e97c6 100644
--- a/packages/grpc-js-xds/package.json
+++ b/packages/grpc-js-xds/package.json
@@ -33,6 +33,7 @@
   "homepage": "https://github.com/grpc/grpc-node#readme",
   "devDependencies": {
     "@grpc/grpc-js": "file:../grpc-js",
+    "@grpc/proto-loader": "file:../proto-loader",
     "@types/gulp": "^4.0.6",
     "@types/gulp-mocha": "0.0.32",
     "@types/mocha": "^5.2.6",