diff --git a/resources/default_tweaks.py b/resources/default_tweaks.py
index 9726ed3b09..b2133ed331 100644
--- a/resources/default_tweaks.py
+++ b/resources/default_tweaks.py
@@ -77,7 +77,7 @@ categories_use_field_for_author_name = 'author'
 #  sort: the sort value. For authors, this is the author_sort for that author
 #  category: the category (e.g., authors, series) that the item is in.
 categories_collapse_more_than = 50
-categories_collapsed_name_template = '{first.name:shorten(4,'',0)} - {last.name::shorten(4,'',0)}'
+categories_collapsed_name_template = '{first.sort:shorten(4,'',0)} - {last.sort:shorten(4,'',0)}'
 categories_collapsed_rating_template = '{first.avg_rating:4.2f:ifempty(0)} - {last.avg_rating:4.2f:ifempty(0)}'
 categories_collapsed_popularity_template = '{first.count:d} - {last.count:d}'
 categories_collapse_model = 'first letter'
diff --git a/src/calibre/gui2/tag_view.py b/src/calibre/gui2/tag_view.py
index f04902283e..d6a7a6d604 100644
--- a/src/calibre/gui2/tag_view.py
+++ b/src/calibre/gui2/tag_view.py
@@ -738,7 +738,7 @@ class TagsModel(QAbstractItemModel): # {{{
                                      category_key=category_node.category_key)
                     else:
                         if upper(tag.sort[0]) != collapse_letter:
-                            collapse_letter = upper(tag.name[0])
+                            collapse_letter = upper(tag.sort[0])
                             sub_cat = TagTreeItem(parent=category,
                                      data = collapse_letter,
                                      category_icon = category_node.icon,