diff --git a/src/config/io.write-prepare.test.ts b/src/config/io.write-prepare.test.ts
index 6fa871a5b19..71cad4903b4 100644
--- a/src/config/io.write-prepare.test.ts
+++ b/src/config/io.write-prepare.test.ts
@@ -75,7 +75,7 @@ describe("config io write prepare", () => {
             },
           },
         },
-      }),
+      }) as OpenClawConfig,
       [["plugins", "installs"]],
     ) as {
       plugins?: {