diff --git a/lib/hexo/post.ts b/lib/hexo/post.ts
index 8e443b0283..66c54d863a 100644
--- a/lib/hexo/post.ts
+++ b/lib/hexo/post.ts
@@ -348,8 +348,7 @@ class Post {
     const { config } = ctx;
     const draftDir = join(ctx.source_dir, '_drafts');
     const slug = slugize(data.slug.toString(), { transform: config.filename_case });
-    data.slug = slug;
-    const regex = new RegExp(`^${escapeRegExp(slug)}(?:[^\\/\\\\]+)`);
+    const regex = new RegExp(`^${escapeRegExp(data.slug.toString())}(?:[^\\/\\\\]+)`);
     let src = '';
     const result: Result = {};