diff --git a/packages/@aws-cdk/toolkit-lib/lib/actions/watch/index.ts b/packages/@aws-cdk/toolkit-lib/lib/actions/watch/index.ts
index 25824c017..eb09ea0af 100644
--- a/packages/@aws-cdk/toolkit-lib/lib/actions/watch/index.ts
+++ b/packages/@aws-cdk/toolkit-lib/lib/actions/watch/index.ts
@@ -1,13 +1,6 @@
 import type { BaseDeployOptions } from '../deploy/private';
 
 export interface WatchOptions extends BaseDeployOptions {
-  /**
-   * The extra string to append to the User-Agent header when performing AWS SDK calls.
-   *
-   * @default - nothing extra is appended to the User-Agent header
-   */
-  readonly extraUserAgent?: string;
-
   /**
    * Watch the files in this list
    *