diff --git a/node/blog.js b/node/blog.js
index 00ab6a7..a3dfd17 100644
--- a/node/blog.js
+++ b/node/blog.js
@@ -76,7 +76,8 @@ function getAdjacentPost(json, index, move) {
         let post = json[index];
         if (!post)
             break;
-        if (post.cat.includes(cat) && !post.archived)
+        // only link to posts with the same main category
+        if (post.cat[0] === cat && !post.archived)
             return post;
     }
 }
\ No newline at end of file