diff --git a/.changeset/brown-rocks-ring.md b/.changeset/brown-rocks-ring.md
new file mode 100644
index 000000000000..a32bd412d8b8
--- /dev/null
+++ b/.changeset/brown-rocks-ring.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Adds `checked` to the list of boolean attributes.
\ No newline at end of file
diff --git a/packages/astro/src/runtime/server/render/util.ts b/packages/astro/src/runtime/server/render/util.ts
index 5dd428b9b11d..ef8a64fa73c6 100644
--- a/packages/astro/src/runtime/server/render/util.ts
+++ b/packages/astro/src/runtime/server/render/util.ts
@@ -7,7 +7,7 @@ import { HTMLString, markHTMLString } from '../escape.js';
 export const voidElementNames =
 	/^(area|base|br|col|command|embed|hr|img|input|keygen|link|meta|param|source|track|wbr)$/i;
 const htmlBooleanAttributes =
-	/^(?:allowfullscreen|async|autofocus|autoplay|controls|default|defer|disabled|disablepictureinpicture|disableremoteplayback|formnovalidate|hidden|loop|nomodule|novalidate|open|playsinline|readonly|required|reversed|scoped|seamless|selected|itemscope)$/i;
+	/^(?:allowfullscreen|async|autofocus|autoplay|checked|controls|default|defer|disabled|disablepictureinpicture|disableremoteplayback|formnovalidate|hidden|loop|nomodule|novalidate|open|playsinline|readonly|required|reversed|scoped|seamless|selected|itemscope)$/i;
 const htmlEnumAttributes = /^(?:contenteditable|draggable|spellcheck|value)$/i;
 // Note: SVG is case-sensitive!
 const svgEnumAttributes = /^(?:autoReverse|externalResourcesRequired|focusable|preserveAlpha)$/i;