diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 86c59e1b..b6682121 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -88,13 +88,11 @@ jobs:
 
       - name: Save pull request artifact
         if: github.event_name == 'pull_request'
-        env:
-          PR_ID: ${{ github.event.number }}
         run: |
           mkdir -p ./artifact
           printf '{
             "is_pr": true,
-            "pr_id": $PR_ID
+            "pr_id": ${{ github.event.number }}
           }' >> ./artifact/artifact.json
 
       - name: Save merge artifact