diff --git a/action.yml b/action.yml
index c542cd1f..f31d8ef4 100644
--- a/action.yml
+++ b/action.yml
@@ -177,6 +177,7 @@ runs:
         GITHUB_EVENT_PULL_REQUEST_BASE_SHA: ${{ github.event.pull_request.base.sha }}
         GITHUB_EVENT_BEFORE: ${{ github.event.before }}
         GITHUB_EVENT_FORCED: ${{ github.event.forced }}
+        GITHUB_REFNAME: ${{ github.ref_name }}
         # INPUT_<VARIABLE_NAME> is not available in Composite run steps
         # https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#example-specifying-inputs
         INPUT_SHA: ${{ inputs.sha }}