diff --git a/.github/workflows/docker.yaml b/.github/workflows/docker.yaml
index d277c522..a1b21b37 100644
--- a/.github/workflows/docker.yaml
+++ b/.github/workflows/docker.yaml
@@ -71,7 +71,7 @@ jobs:
       - uses: kanga333/variable-mapper@master
         id: export
         with:
-          key: "${{github.base_ref}}"
+          key: "${{ matrix.project }}"
           map: |
             {
               "delta": {