diff --git a/index.d.ts b/index.d.ts
index a45592d..a068054 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -13,11 +13,10 @@ declare namespace createError {
     name: string;
     statusCode?: number;
   }
+
   interface FastifyErrorConstructor {
     new(a?: any, b?: any, c?: any): FastifyError;
     (a?: any, b?: any, c?: any): FastifyError;
     readonly prototype: FastifyError;
   }
-
-  var FastifyError: FastifyErrorConstructor;
 }
diff --git a/index.test-d.ts b/index.test-d.ts
index e4de41b..fce08fc 100644
--- a/index.test-d.ts
+++ b/index.test-d.ts
@@ -7,4 +7,4 @@ const err = new CustomError()
 expectType<FastifyError>(err)
 expectType<string>(err.code)
 expectType<string>(err.message)
-expectType<number>(err.statusCode!)
+expectType<number>(err.statusCode!)
\ No newline at end of file