diff --git a/source/blog.html b/source/blog.html
index ccf5caba..6579fbe5 100644
--- a/source/blog.html
+++ b/source/blog.html
@@ -20,7 +20,7 @@ use: [posts]
                 {% include 'post/intro-image' with { page: post } %}
 
                 <div class="mb-4">
-                    {% if post.blocks.excerpt %}
+                    {% if post.blocks.excerpt is defined %}
                         {{ post.blocks.excerpt|markdown }}
                     {% else %}
                         {{ post.blocks.content|markdown }}