diff --git a/.github/workflows/backend.yml b/.github/workflows/backend.yml
index 2b9c6f9..6f4161c 100644
--- a/.github/workflows/backend.yml
+++ b/.github/workflows/backend.yml
@@ -27,9 +27,14 @@ jobs:
       - name: Set Env Vars
         id: vars
         run: |
-          echo 'BASE_TAG=sha-$(git rev-parse --short HEAD)' >> $GITHUB_OUTPUT
+          echo 'BASE_TAG=sha-'$(git rev-parse --short HEAD) >> $GITHUB_OUTPUT
           echo "PLONE_VERSION=$(cat version.txt)" >> $GITHUB_OUTPUT
 
+      - name: Test vars
+        run: |
+          echo 'BASE_TAG=${{ steps.vars.outputs.BASE_TAG }}'
+          echo 'PLONE_VERSION=${{ steps.vars.outputs.VOLTO_VERSION }}'
+
   code-quality:
     runs-on: ubuntu-latest
     needs:
diff --git a/.github/workflows/frontend.yml b/.github/workflows/frontend.yml
index f2f6e43..391e83a 100644
--- a/.github/workflows/frontend.yml
+++ b/.github/workflows/frontend.yml
@@ -25,7 +25,7 @@ jobs:
       - name: Compute several vars needed for the build
         id: vars
         run: |
-          echo 'BASE_TAG=sha-$(git rev-parse --short HEAD)' >> $GITHUB_OUTPUT
+          echo 'BASE_TAG=sha-'$(git rev-parse --short HEAD) >> $GITHUB_OUTPUT
           python3 -c 'import json; data = json.load(open("./mrs.developer.json")); print("VOLTO_VERSION=" + data["core"].get("tag") or "latest")' >> $GITHUB_OUTPUT
       - name: Test vars
         run: |
diff --git a/.github/workflows/tag.yml b/.github/workflows/tag.yml
index 0e6091a..9691fbf 100644
--- a/.github/workflows/tag.yml
+++ b/.github/workflows/tag.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Compute several vars needed for the build
         id: vars
         run: |
-          echo 'BASE_TAG=sha-$(git rev-parse --short HEAD)' >> $GITHUB_OUTPUT
+          echo 'BASE_TAG=sha-'$(git rev-parse --short HEAD) >> $GITHUB_OUTPUT
           echo "PLONE_VERSION=$(cat version.txt)" >> $GITHUB_OUTPUT
           python3 -c 'import json; data = json.load(open("./mrs.developer.json")); print("VOLTO_VERSION=" + data["core"].get("tag") or "latest")' >> $GITHUB_OUTPUT
       - name: Test vars