diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index b28480d..90bb7d8 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -17,7 +17,7 @@ jobs:
       run: echo ${{ secrets.GHCR_TOKEN }} | docker login ghcr.io -u ${{ github.actor }} --password-stdin
 
     - name: Build Docker image
-      run: docker build -t ghcr.io/${{ github.actor }}/my-app:latest .
+      run: docker build -t ghcr.io/$(echo ${{ github.actor }} | tr '[:upper:]' '[:lower:]')/my-app:latest .
 
     - name: Push Docker image
       run: docker push ghcr.io/${{ github.actor }}/my-app:latest