diff --git a/.github/workflows/osrm-backend-docker.yml b/.github/workflows/osrm-backend-docker.yml
index ad1ce77c4..e86926c26 100644
--- a/.github/workflows/osrm-backend-docker.yml
+++ b/.github/workflows/osrm-backend-docker.yml
@@ -56,8 +56,8 @@ jobs:
           push: true
           file: ./docker/Dockerfile
           tags:  ${{ steps.meta.outputs.labels }}
-          build-args: 
-          - DOCKER_TAG: ${{ join(steps.metaassertions.outputs.labels }}
+          build-args: |
+            DOCKER_TAG=${{ join(steps.metaassertions.outputs.labels }}
 
 
       - name: Build container image - debug
@@ -66,8 +66,8 @@ jobs:
           push: true
           file: ./docker/Dockerfile
           tags: ${{ steps.metadebug.outputs.labels }}
-          build-args:     
-          - DOCKER_TAG: ${{ join(steps.metaassertions.outputs.labels }}
+          build-args: |
+            DOCKER_TAG=${{ join(steps.metaassertions.outputs.labels }}
 
 
       - name: Build container image - assertions
@@ -76,8 +76,8 @@ jobs:
           push: true
           file: ./docker/Dockerfile
           tags: ${{ steps.metaassertions.outputs.labels }}
-          build-args:     
-          - DOCKER_TAG: ${{ join(steps.metaassertions.outputs.labels }}
+          build-args: |
+            DOCKER_TAG=${{ join(steps.metaassertions.outputs.labels }}
 
 
             
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