diff --git a/tools/ci-tools.ts b/tools/ci-tools.ts
index 1491adaddc..b872c35187 100644
--- a/tools/ci-tools.ts
+++ b/tools/ci-tools.ts
@@ -83,7 +83,7 @@ async function setPrLabels(): Promise<void> {
         Accept: 'application/vnd.github+json',
         Authorization: `Bearer ${env.GITHUB_TOKEN}`,
         'X-GitHub-Api-Version': '2022-11-28',
-        ...(body && {'Content-Type': 'application/json'}),
+        ...(Boolean(body) && {'Content-Type': 'application/json'}),
       },
       body: body ? JSON.stringify(body) : undefined,
     });