diff --git a/.github/workflows/easycloud-build.yml b/.github/workflows/easycloud-build.yml
index b6c5381c3278a..c2087b2f1b282 100644
--- a/.github/workflows/easycloud-build.yml
+++ b/.github/workflows/easycloud-build.yml
@@ -57,6 +57,9 @@ jobs:
           PUPPETEER_SKIP_DOWNLOAD: true
         run: make -f IONOS/Makefile build_dep_simplesettings_app
 
+      - name: Install dependencies & build viewer app
+        run: make -f IONOS/Makefile build_dep_viewer_app
+
       - name: Install dependencies & build user_oidc app
         env:
           CYPRESS_INSTALL_BINARY: 0