diff --git a/news/changelog-1.8.md b/news/changelog-1.8.md
index 919da4b512..25a2f738b6 100644
--- a/news/changelog-1.8.md
+++ b/news/changelog-1.8.md
@@ -106,6 +106,7 @@ All changes included in 1.8:
 - ([#13112](https://github.com/quarto-dev/quarto-cli/pull/13112)): Add `quarto.format.format_identifier()` API entry.
 - ([#13128](https://github.com/quarto-dev/quarto-cli/issues/13128)): Avoid meta shortcode crash on bad input.
 - ([#13246](https://github.com/quarto-dev/quarto-cli/pull/13246)): Add `quarto.variables.get()` and `quarto.metadata.get()` APIs.
+- ([#13334](https://github.com/quarto-dev/quarto-cli/issues/13334)): Fix wrong function being called on `is_html_slide_output` and `is_markdown_with_html_output`.
 
 ## Commands
 
diff --git a/src/resources/pandoc/datadir/_format.lua b/src/resources/pandoc/datadir/_format.lua
index 64fe30c587..011e2bf5a2 100644
--- a/src/resources/pandoc/datadir/_format.lua
+++ b/src/resources/pandoc/datadir/_format.lua
@@ -326,13 +326,13 @@ local function _main()
     isMarkdownOutput = isMarkdownOutput,
     is_markdown_output = isMarkdownOutput,
     isMarkdownWithHtmlOutput = isMarkdownWithHtmlOutput,
-    is_markdown_with_html_output = isMarkdownOutput,
+    is_markdown_with_html_output = isMarkdownWithHtmlOutput,
     isIpynbOutput = isIpynbOutput, 
     is_ipynb_output = isIpynbOutput,
     isHtmlOutput = isHtmlOutput, 
     is_html_output = isHtmlOutput,
     isHtmlSlideOutput = isHtmlSlideOutput,
-    is_html_slide_output = isHtmlOutput,
+    is_html_slide_output = isHtmlSlideOutput,
     isBibliographyOutput = isBibliographyOutput,
     is_bibliography_output = isBibliographyOutput,
     isNativeOutput = isNativeOutput,