diff --git a/packages/angular/build/src/builders/karma/index.ts b/packages/angular/build/src/builders/karma/index.ts
index 1e5f5613e3a3..d3aefeeff628 100644
--- a/packages/angular/build/src/builders/karma/index.ts
+++ b/packages/angular/build/src/builders/karma/index.ts
@@ -99,6 +99,7 @@ function getBuiltInKarmaConfig(
   // Any changes to the config here need to be synced to: packages/schematics/angular/config/files/karma.conf.js.template
   return {
     basePath: '',
+    rootUrl: '/',
     frameworks: ['jasmine'],
     plugins: [
       'karma-jasmine',
@@ -106,6 +107,9 @@ function getBuiltInKarmaConfig(
       'karma-jasmine-html-reporter',
       'karma-coverage',
     ].map((p) => workspaceRootRequire(p)),
+    proxies: {
+      '/': '/base/',
+    },
     jasmineHtmlReporter: {
       suppressAll: true, // removes the duplicated traces
     },