diff --git a/resources/compiled_coffeescript.zip b/resources/compiled_coffeescript.zip
index a623cbdb01..cdb6a36af8 100644
Binary files a/resources/compiled_coffeescript.zip and b/resources/compiled_coffeescript.zip differ
diff --git a/src/calibre/ebooks/oeb/polish/preview.coffee b/src/calibre/ebooks/oeb/polish/preview.coffee
index 21119c419d..7e0652cbc5 100644
--- a/src/calibre/ebooks/oeb/polish/preview.coffee
+++ b/src/calibre/ebooks/oeb/polish/preview.coffee
@@ -325,8 +325,8 @@ class PreviewIntegration
             elem = document.querySelector('[name="' + anchor + '"]')
         if elem
             elem.scrollIntoView()
-            lnum = elem.getAttribute('data-lnum')
-        window.py_bridge.request_sync('', '', lnum)
+            address = get_sourceline_address(elem)
+        window.py_bridge.request_sync('', '', address)
 
     live_css: (sourceline, tags) =>
         target = null