diff --git a/.changeset/angry-chairs-marry.md b/.changeset/angry-chairs-marry.md
new file mode 100644
index 00000000..445fac09
--- /dev/null
+++ b/.changeset/angry-chairs-marry.md
@@ -0,0 +1,5 @@
+---
+'preact-render-to-string': patch
+---
+
+Fix `spellcheck={false}` not rendering as `spellcheck="false"`