diff --git a/_includes/_macro/post.html b/_includes/_macro/post.html
index d56ed14455..b14766a41f 100644
--- a/_includes/_macro/post.html
+++ b/_includes/_macro/post.html
@@ -107,7 +107,7 @@
                 </span>
 
                 {% assign cat_length = post.categories.size %}
-                {% if cat_length > 1 and loop.index != cat_length %}
+                {% if cat_length > 1 and forloop.index != cat_length %}
                   {{ __.symbol.comma }}
                 {% endif %}
               {% endfor %}