diff --git a/packages/grpc-native-core/index.d.ts b/packages/grpc-native-core/index.d.ts
index 2934ce922..73a685cd4 100644
--- a/packages/grpc-native-core/index.d.ts
+++ b/packages/grpc-native-core/index.d.ts
@@ -66,7 +66,7 @@ declare module "grpc" {
    * - Anything else becomes the relevant reflection object that ProtoBuf.js would create
    */
   export interface GrpcObject {
-    [name: string]: GrpcObject | typeof Client | Message;
+    [name: string]: GrpcObject | typeof Client | Message<any>;
   }
 
   /**