diff --git a/src/App.vue b/src/App.vue
index f5342b0..1ffea5f 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -33,7 +33,7 @@
                               url_root +
                               'pdfjs/web/viewer.html?file=' +
                               url_root +
-                              'categories' +
+                              'categories/' +
                               category.name +
                               '/' +
                               file