diff --git a/.github/workflows/build_docker.yml b/.github/workflows/build_docker.yml
index 11dd7a967b..8307bf5886 100644
--- a/.github/workflows/build_docker.yml
+++ b/.github/workflows/build_docker.yml
@@ -26,13 +26,13 @@ on:
 
 env:
   DOCKER_TAG: |
-    $(echo "px4io/px4-dev:${{
+    "px4io/px4-dev:${{
       github.event_name == 'pull_request' && github.sha ||
         (
           github.event_name == 'push' && 'latest' ||
           github.event.release.name
         )
-    }}" | tr -d '\n')
+    }}"
 
 jobs:
   build_docker:
@@ -129,9 +129,10 @@ jobs:
             #--volume=/tmp:/tmp:rw \
             #--volume=${GITHUB_ACTION_PATH}:${GITHUB_ACTION_PATH}:rw \
             #px4io/px4-dev:${{ env.DOCKER_TAG }} /bin/bash -c "make ${{ matrix.target }}"
+
         run: |
           docker run --rm -w "${{ env.GITHUB_ACTION_PATH }}" \
             --env=LOCAL_USER_ID="$(id -u)" \
             --volume=/tmp:/tmp:rw \
             --volume=${{ env.GITHUB_ACTION_PATH }}:${{ env.GITHUB_ACTION_PATH }}:rw \
-            ${{ env.DOCKER_TAG }} /bin/bash -c "make px4_fmu-v6x"
+            $(echo "$DOCKER_TAG" | tr -d '\n') /bin/bash -c "make px4_fmu-v6x"