diff --git a/src/calibre/gui2/book_details.py b/src/calibre/gui2/book_details.py
index 8d18a38e2f..908ea7f3ae 100644
--- a/src/calibre/gui2/book_details.py
+++ b/src/calibre/gui2/book_details.py
@@ -523,10 +523,11 @@ def add_item_specific_entries(menu, data, book_info, copy_menu, search_menu):
                 v = data.get('original_value') or data.get('value')
                 copy_menu.addAction(QIcon.ic('edit-copy.png'), _('The text: {}').format(v),
                                         lambda: QApplication.instance().clipboard().setText(v))
-            ac = book_info.remove_item_action
-            ac.data = (field, remove_value, book_id)
-            ac.setText(_('Remove %s from this book') % escape_for_menu(remove_name or data.get('original_value') or value))
-            menu.addAction(ac)
+            if field != 'size':
+                ac = book_info.remove_item_action
+                ac.data = (field, remove_value, book_id)
+                ac.setText(_('Remove %s from this book') % escape_for_menu(remove_name or data.get('original_value') or value))
+                menu.addAction(ac)
             # See if we need to add a click associated link menu line
             link_map = get_gui().current_db.new_api.get_all_link_maps_for_book(data.get('book_id', -1))
             link = link_map.get(field, {}).get(value)