diff --git a/action.yml b/action.yml
index 7d4b78b..06f89be 100644
--- a/action.yml
+++ b/action.yml
@@ -48,7 +48,8 @@ runs:
       id: get_head_branch
       working-directory: ${{ inputs.working_directory }}
       run: |
-        head_branch="{git for-each-ref --format="%(upstream:short)" $(git symbolic-ref -q HEAD)}"
+        head_branch_ref="{git symbolic-ref -q HEAD}"
+        head_branch="$(git for-each-ref --format="%(upstream:short)" $head_branch_ref)"
         echo "Current Head Branch: $head_branch"
         echo "head_branch=$current_branch" >> "$GITHUB_OUTPUT"
       shell: bash