diff --git a/.changeset/sour-teachers-kiss.md b/.changeset/sour-teachers-kiss.md
new file mode 100644
index 000000000000..3e280de089f5
--- /dev/null
+++ b/.changeset/sour-teachers-kiss.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Correctly type the option `server.open`
diff --git a/packages/astro/src/@types/astro.ts b/packages/astro/src/@types/astro.ts
index 59594446c110..a3fcdcedda9a 100644
--- a/packages/astro/src/@types/astro.ts
+++ b/packages/astro/src/@types/astro.ts
@@ -335,6 +335,22 @@ type ServerConfig = {
 	 * Set custom HTTP response headers to be sent in `astro dev` and `astro preview`.
 	 */
 	headers?: OutgoingHttpHeaders;
+
+	/**
+	 * @name server.open
+	 * @type {boolean}
+	 * @default `false`
+	 * @version 2.1.8
+	 * @description
+	 * Control whether the dev server should open in your browser window on startup.
+	 *
+	 * ```js
+	 * {
+	 *   server: { open: true }
+	 * }
+	 * ```
+	 */
+	open?: boolean;
 };
 
 export interface ViteUserConfig extends vite.UserConfig {
@@ -878,6 +894,21 @@ export interface AstroUserConfig {
 	 * ```
 	 */
 
+	/**
+	 * @name server.open
+	 * @type {boolean}
+	 * @default `false`
+	 * @version 2.1.8
+	 * @description
+	 * Control whether the dev server should open in your browser window on startup.
+	 *
+	 * ```js
+	 * {
+	 *   server: { open: true }
+	 * }
+	 * ```
+	 */
+
 	/**
 	 * @docs
 	 * @name server.headers