diff --git a/packages/angular/build/src/builders/dev-server/vite-server.ts b/packages/angular/build/src/builders/dev-server/vite-server.ts
index dfe8035acde0..b09775c4a312 100644
--- a/packages/angular/build/src/builders/dev-server/vite-server.ts
+++ b/packages/angular/build/src/builders/dev-server/vite-server.ts
@@ -439,7 +439,10 @@ export async function* serveWithVite(
         componentStyles,
         templateUpdates,
         browserOptions.loader as EsbuildLoaderOption | undefined,
-        browserOptions.define,
+        {
+          ...browserOptions.define,
+          'ngHmrMode': browserOptions.templateUpdates ? 'true' : 'false',
+        },
         extensions?.middleware,
         transformers?.indexHtml,
         thirdPartySourcemaps,