diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-results.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-results.tt
index 91424f167d..8da6fb0f4d 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-results.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-results.tt
@@ -488,7 +488,7 @@
         var theme = "[% theme | html %]";
         const firstPage = [% firstPage ? 1 : 0 | html %];
         Koha.addPrefs({
-            OpacHighlightedWords: "[% Koha.Preference('OpacHighlightedWords') | html %]",
+            OpacHighlightedWords: [% Koha.Preference('OpacHighlightedWords') ? 1 : 0 | html %],
             NotHighlightedWords: "[% Koha.Preference("NotHighlightedWords") | html %]",
             GoogleJackets: [% Koha.Preference("GoogleJackets") ? 1 : 0 | html %],
             OpenLibraryCovers: [% Koha.Preference("OpenLibraryCovers") ? 1 : 0 | html %],