diff --git a/_config.yml b/_config.yml
index 7dfb64d..d93c811 100644
--- a/_config.yml
+++ b/_config.yml
@@ -77,7 +77,7 @@ avatar: /nspawn.png
 
 # The URL of the site-wide social preview image used in SEO `og:image` meta tag.
 # It can be overridden by a customized `page.image` in front matter.
-social_preview_image: # string, local or CORS resources
+social_preview_image: /nspawn.png # string, local or CORS resources
 
 # boolean type, the global switch for TOC in posts.
 toc: true