diff --git a/_includes/seo.html b/_includes/seo.html
index 13ffe77a..58f499b5 100644
--- a/_includes/seo.html
+++ b/_includes/seo.html
@@ -52,7 +52,7 @@
   <meta property="og:description" content="{{ seo_description }}">
 {% endif %}
 
-{% if site.twitter %}
+{% if site.twitter.username %}
   <meta name="twitter:site" content="@{{ site.twitter.username | replace: "@", "" }}">
   <meta name="twitter:title" content="{{ page.title | default: site.title | markdownify | strip_html | strip_newlines | escape_once }}">
   <meta name="twitter:description" content="{{ seo_description }}">