diff --git a/inst/rmarkdown/resources/govuk.lua b/inst/rmarkdown/resources/govuk.lua
index 5b10c77..4333bb0 100644
--- a/inst/rmarkdown/resources/govuk.lua
+++ b/inst/rmarkdown/resources/govuk.lua
@@ -42,7 +42,7 @@ return {
           '<details class="govuk-details" data-module="govuk-details">' ..
           '<summary class="govuk-details__summary">' ..
           '<span class="govuk-details__summary-text">'..
-          pandoc.utils.stringify(el.attributes["summary"]) ..
+          el.attributes["summary"] ..
           '</span>'..
           '</summary>' ..
           '<div class="govuk-details__text">'