diff --git a/src/calibre/gui2/tweak_book/live_css.py b/src/calibre/gui2/tweak_book/live_css.py
index ff515a4250..ae1f9960fb 100644
--- a/src/calibre/gui2/tweak_book/live_css.py
+++ b/src/calibre/gui2/tweak_book/live_css.py
@@ -16,7 +16,6 @@
 from calibre.gui2.tweak_book.editor.themes import get_theme, theme_color
 from calibre.gui2.tweak_book.editor.text import default_font_family
 from css_selectors import parse, SelectorError
-from polyglot.builtins import unicode_type
 
 
 lowest_specificity = (-sys.maxsize, 0, 0, 0, 0, 0)