diff --git a/google/cloud/dataproc/v1/clusters.proto b/google/cloud/dataproc/v1/clusters.proto
index fbaf9391ed088..c66d35d372f8d 100644
--- a/google/cloud/dataproc/v1/clusters.proto
+++ b/google/cloud/dataproc/v1/clusters.proto
@@ -111,8 +111,8 @@ service ClusterController {
     };
     option (google.api.method_signature) = "project_id,region,cluster_name";
     option (google.longrunning.operation_info) = {
-      response_type: "google.protobuf.Empty"
-      metadata_type: "DiagnoseClusterResults"
+      response_type: "DiagnoseClusterResults"
+      metadata_type: "google.cloud.dataproc.v1.ClusterOperationMetadata"
     };
   }
 }