diff --git a/scripts/tasks/test-runner-build.ts b/scripts/tasks/test-runner-build.ts
index 2dd783abaf00..9cecf1672120 100644
--- a/scripts/tasks/test-runner-build.ts
+++ b/scripts/tasks/test-runner-build.ts
@@ -13,7 +13,7 @@ export const testRunnerBuild: Task & { port: number } = {
   async run({ sandboxDir, junitFilename }, { dryRun, debug }) {
     const execOptions = { cwd: sandboxDir };
     const flags = [
-      `--url http://localhost:${this.port}`,
+      `--url http://127.0.0.1:${this.port}`,
       '--junit',
       '--maxWorkers=2',
       '--failOnConsole',