diff --git a/src/calibre/library/server/browse.py b/src/calibre/library/server/browse.py
index 0f4878b06c..41e779fee1 100644
--- a/src/calibre/library/server/browse.py
+++ b/src/calibre/library/server/browse.py
@@ -373,7 +373,7 @@ class BrowseServer(object):
                 continue
             # get the icon files
             if category in self.icon_map:
-                icon = '_'+quote(self.icon_map[category])
+                icon = '_'+quote(self.icon_map[category.partition('.')[0]])
             elif category in category_icon_map:
                 icon = category_icon_map[category]
             elif meta['is_custom']: