diff --git a/.github/workflows/build-subimage.yml b/.github/workflows/build-subimage.yml
index b054480..cc86acb 100644
--- a/.github/workflows/build-subimage.yml
+++ b/.github/workflows/build-subimage.yml
@@ -46,7 +46,7 @@ jobs:
         with:
           context: .
           file: Dockerfile-${{ inputs.subimage }}
-          build-args:
+          build-args: |
             DRONE_COMMIT=sha-${{ github.sha }}
             BUILDKIT_INLINE_CACHE=1
           tags: ${{ steps.meta.outputs.tags }}