diff --git a/src/calibre/gui2/tweak_book/editor/themes.py b/src/calibre/gui2/tweak_book/editor/themes.py
index 1c16ecea96..5c6d2352d4 100644
--- a/src/calibre/gui2/tweak_book/editor/themes.py
+++ b/src/calibre/gui2/tweak_book/editor/themes.py
@@ -98,7 +98,7 @@ THEMES = {
     SpecialCharacter bg={cursor_loc}
 
     '''.format(
-        cursor_loc='3d3d3d',
+        cursor_loc='343434',
         identifier='cae682',
         comment='99968b',
         string='95e454',