diff --git a/.github/workflows/build-devcontainer.yml b/.github/workflows/build-devcontainer.yml
index f9627f7..f79e8b4 100644
--- a/.github/workflows/build-devcontainer.yml
+++ b/.github/workflows/build-devcontainer.yml
@@ -35,7 +35,7 @@ jobs:
           # example value : "ghcr.io/IONOS-Wordpress/ionos-wordpress-develop-devcontainer"
           IMAGE_NAME="ghcr.io/${GITHUB_REPOSITORY}-${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}-devcontainer"
           # convert imagename to lowercase and store as environment variable
-          echo "${IMAGE_NAME@L}" >> ${GITHUB_ENV}
+          echo "${IMAGE_NAME@L}" >> $GITHUB_ENV
 
       - name: Pre-build image and run make ci-build in dev container
         uses: devcontainers/ci@v0.3