diff --git a/tools/ci/format_changelog b/tools/ci/format_changelog
index 83b129d40e9..4fbdca1eaf1 100755
--- a/tools/ci/format_changelog
+++ b/tools/ci/format_changelog
@@ -63,11 +63,10 @@ ${pr_header}
 ${changelog_content}
 EOF
   fi
-  {
-    echo "$pr_body<<EOF"
-${pr_body}
-    echo EOF
-  } >> $GITHUB_OUTPUT
+  # for multi-line output
+  echo "pr_body<<EOF" >> $GITHUB_OUTPUT
+  echo "${pr_body}" >> $GITHUB_OUTPUT
+  echo "EOF" >> $GITHUB_OUTPUT
 }
 
 set_new_changelog_content() {