diff --git a/packages/svelte2tsx/svelte-jsx.d.ts b/packages/svelte2tsx/svelte-jsx.d.ts
index 842def708..87bb3fa87 100644
--- a/packages/svelte2tsx/svelte-jsx.d.ts
+++ b/packages/svelte2tsx/svelte-jsx.d.ts
@@ -325,6 +325,7 @@ declare namespace svelte.JSX {
       novalidate?: boolean;
       open?: boolean;
       optimum?: number;
+      part?: string;
       pattern?: string;
       placeholder?: string;
       playsinline?: boolean;