diff --git a/packages/@apphosting/adapter-angular/src/interface.ts b/packages/@apphosting/adapter-angular/src/interface.ts
index 201b7257..109211f7 100644
--- a/packages/@apphosting/adapter-angular/src/interface.ts
+++ b/packages/@apphosting/adapter-angular/src/interface.ts
@@ -35,7 +35,7 @@ export interface ValidManifest {
   errors: string[];
   warnings: string[];
   outputPaths: OutputPaths;
-  prerenderedRoutes?: string[] | undefined;
+  prerenderedRoutes?: string[] | object | undefined;
 }
 
 // valid output paths schema