diff --git a/.github/workflows/docker-build-master.yaml b/.github/workflows/docker-build-master.yaml
index 60ab6048..88277193 100644
--- a/.github/workflows/docker-build-master.yaml
+++ b/.github/workflows/docker-build-master.yaml
@@ -35,4 +35,4 @@ jobs:
           tags: registry.nova.do/shairport-sync:unstable-${{ env.BRANCH }}
           build-args: |
             BRANCH=${{ env.BRANCH }}
-          ssh: ${{ secrets.SSH_PRIVATE_KEY }}
\ No newline at end of file
+          ssh: [ ${{ secrets.SSH_PRIVATE_KEY }} ]
\ No newline at end of file