diff --git a/packages/grpc/src/comsumer/clients.ts b/packages/grpc/src/comsumer/clients.ts
index 165c5a16dc1..bd33af379b5 100644
--- a/packages/grpc/src/comsumer/clients.ts
+++ b/packages/grpc/src/comsumer/clients.ts
@@ -71,15 +71,16 @@ export class GRPCClients extends Map {
           connectionService[methodName] = (
             clientOptions: IClientOptions = {}
           ) => {
+            const meta = new Metadata();
+            meta.set('rpc.definition', definition);
+            meta.set('rpc.method', methodName);
+
             if (clientOptions.metadata) {
-              const meta = new Metadata();
               meta.merge(clientOptions.metadata);
               clientOptions.metadata = meta;
             } else {
-              clientOptions.metadata = new Metadata();
+              clientOptions.metadata = meta;
             }
-            clientOptions.metadata.set('rpc.definition', definition);
-            clientOptions.metadata.set('rpc.method', methodName);
 
             return this.getClientRequestImpl(
               connectionService,