diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index e0b38c6929..11a8ea2be5 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -41,6 +41,11 @@ jobs:
       - name: Install all Playwright browsers
         run: task e2e:install
 
+      - name: Build frontend (production bundle for vite preview)
+        env:
+          VITE_BUILD_FOR_PREVIEW: "1"
+        run: task frontend:build
+
       - name: Run E2E tests (all browsers)
         run: task e2e:cross-browser