diff --git a/index.d.ts b/index.d.ts
index 838cf1c..3d6a1e4 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -71,12 +71,9 @@ declare interface VMScriptGMInfoObject {
   platform: VMScriptGMInfoPlatform;
   /**
    * A copy of navigator.userAgentData from the content script of the extension.
+   * Not present in browsers that don't implement this API.
    * @since VM2.20.2 */
-  userAgentData?: {
-    brands: {brand: string, version: string}[],
-    mobile: boolean,
-    platform: string,
-  };
+  userAgentData?: NavigatorUAData;
 }
 
 /**
diff --git a/package.json b/package.json
index f733de4..3ab7224 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
   "repository": "git@github.com:violentmonkey/types.git",
   "devDependencies": {
     "typedoc": "^0.25.6",
-    "typescript": "^5.3.3"
+    "typescript": "^5.3.3",
+    "user-agent-data-types": "^0.4.2"
   }
 }
diff --git a/tsconfig.json b/tsconfig.json
index af24104..323d3b6 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,6 +7,7 @@
     "allowSyntheticDefaultImports": true
   },
   "include": [
+    "./node_modules/user-agent-data-types/index.d.ts",
     "index.d.ts"
   ]
 }