diff --git a/src/calibre/devices/kobo/driver.py b/src/calibre/devices/kobo/driver.py
index e675b94b6c..c8e2c77769 100644
--- a/src/calibre/devices/kobo/driver.py
+++ b/src/calibre/devices/kobo/driver.py
@@ -2347,10 +2347,10 @@ class KOBOTOUCH(KOBO):
             extra_css=self.extra_css or '',
             affect_hyphenation=bool(self.get_pref('affect_hyphenation')),
             disable_hyphenation=bool(self.get_pref('disable_hyphenation')),
-            hyphenation_min_chars=bool(self.get_pref('hyphenation_min_chars')),
-            hyphenation_min_chars_before=bool(self.get_pref('hyphenation_min_chars_before')),
-            hyphenation_min_chars_after=bool(self.get_pref('hyphenation_min_chars_after')),
-            hyphenation_limit_lines=bool(self.get_pref('hyphenation_limit_lines')),
+            hyphenation_min_chars=self.get_pref('hyphenation_min_chars'),
+            hyphenation_min_chars_before=self.get_pref('hyphenation_min_chars_before'),
+            hyphenation_min_chars_after=self.get_pref('hyphenation_min_chars_after'),
+            hyphenation_limit_lines=self.get_pref('hyphenation_limit_lines'),
             remove_at_page_rules=self.extra_css_options.get('has_atpage', False),
             remove_widows_and_orphans=self.extra_css_options.get('has_widows_orphans', False),
         )