diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 02e1bcbf..c87cbd28 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -46,13 +46,15 @@ jobs:
       env:
         name: jburel/omero-web-standalone
         nameParent: jburel/omero-web:latest
+        folder: standalone
       steps:
+        - uses: actions/checkout@v2
         - name: Get other tags
           id: gettags
           uses: jupyterhub/action-major-minor-tag-calculator@v2.0.0
           with:
             githubToken: ${{ secrets.GITHUB_TOKEN }}
-            prefix: "${{ env.name}}:"
+            prefix: "${{ env.name }}:"
         - name: Login to DockerHub
           uses: docker/login-action@v1
           with:
@@ -61,6 +63,8 @@ jobs:
         - name: Push to Docker Hub
           uses: docker/build-push-action@v2
           with:
-            build-args: "PARENT_IMAGE=${{ env.nameParent }}"
+            build-args: |
+              "PARENT_IMAGE=${{ env.nameParent }}"
+            context: ${{ env.folder }}
             tags: ${{ join(fromJson(steps.gettags.outputs.tags)) }}
             push: true