diff --git a/.github/workflows/dockerBuild.yml b/.github/workflows/dockerBuild.yml
index 2f89be90..ca65fc1e 100644
--- a/.github/workflows/dockerBuild.yml
+++ b/.github/workflows/dockerBuild.yml
@@ -26,11 +26,24 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Fetch main
+        run: |
+          git remote set-branches --add origin main
+          git fetch --depth 1
+
+      - name: Check for changes
+        id: diff
+        run: |
+          git diff --exit-code --no-patch origin/main docker/nas2d-${{ matrix.platform }}.* ; echo "modified=$?" >> $ GITHUB_OUTPUT ; true
+
       - name: Docker build
+        if: ${{ fromJSON(steps.diff.outputs.modified) }}
         run: make -C docker build-image-${{ matrix.platform }}
 
       - name: Docker login
+        if: ${{ fromJSON(steps.diff.outputs.modified) }}
         run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io --username "${{ github.repository_owner }}" --password-stdin
 
       - name: Docker push
+        if: ${{ fromJSON(steps.diff.outputs.modified) }}
         run: make -C docker push-image-${{ matrix.platform }}