diff --git a/.github/workflows/push-to-external-repo.yml b/.github/workflows/push-to-external-repo.yml
index ea92234..a1d982d 100644
--- a/.github/workflows/push-to-external-repo.yml
+++ b/.github/workflows/push-to-external-repo.yml
@@ -23,10 +23,10 @@ jobs:
         id: branch
         run: |
           if [ "${{ github.event_name }}" == "pull_request" ] && [ "${{ github.event.action }}" == "opened" ]; then
-            pr_number=$(echo "${{ github.event.number }}")
-            echo "{branch}={${pr_number}-preview}" >> $GITHUB_OUTPUT
+            pr_number="${{ github.event.number }}"
+            echo "branch=${pr_number}-preview" >> $GITHUB_OUTPUT
           else
-            echo "{branch}={main}" >> $GITHUB_OUTPUT
+            echo "branch=main" >> $GITHUB_OUTPUT
           fi
 
       - name: Publish to external repository