diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a8a51cab3..74025b0dc 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -27,9 +27,12 @@ jobs:
         registry: docker.pkg.github.com
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
+    - name: downcase REPO
+      run: |
+        echo "REPO=${GITHUB_REPOSITORY@L}" >> ${GITHUB_ENV}
     - name: Build and push Docker image
       uses: docker/build-push-action@v6
       with:
         context: .
         push: true
-        tags: docker.pkg.github.com/${{ github.repository }}/seshat/tests-image:latest
\ No newline at end of file
+        tags: docker.pkg.github.com/${ env.REPO }/seshat/tests-image:latest
\ No newline at end of file
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 40ac86c82..896cc61a0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -18,10 +18,13 @@ jobs:
         registry: docker.pkg.github.com
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
+    - name: downcase REPO
+      run: |
+        echo "REPO=${GITHUB_REPOSITORY@L}" >> ${GITHUB_ENV}
     - name: Pull and run Docker image
       run: |
-        docker pull docker.pkg.github.com/${{ github.repository }}/seshat/tests-image:latest
-        docker run -d -p 5432:5432 -v ${{ github.workspace }}:/seshat -e DJANGO_SETTINGS_MODULE=seshat.settings.local -e POSTGRES_PASSWORD=postgres -e PGDATA=/var/lib/postgresql/data/db-files/ -e GITHUB_ACTIONS='true' --name seshat_testing docker.pkg.github.com/${{ github.repository }}/seshat/tests-image:latest
+        docker pull docker.pkg.github.com/${ env.REPO }/seshat/tests-image:latest
+        docker run -d -p 5432:5432 -v ${{ github.workspace }}:/seshat -e DJANGO_SETTINGS_MODULE=seshat.settings.local -e POSTGRES_PASSWORD=postgres -e PGDATA=/var/lib/postgresql/data/db-files/ -e GITHUB_ACTIONS='true' --name seshat_testing docker.pkg.github.com/${ env.REPO }/seshat/tests-image:latest
     - name: Sleep, then check PostgreSQL connectivity
       run: |
         sleep 10