diff --git a/_11ty/getTagList.js b/_11ty/getTagList.js
index 8b57265..1b7be79 100644
--- a/_11ty/getTagList.js
+++ b/_11ty/getTagList.js
@@ -21,7 +21,7 @@ module.exports = function(collection) {
       });
 
       for (const tag of tags) {
-        set.add(tag);
+        tagSet.add(tag);
       }
     }
   });