diff --git a/packages/grafana-data/src/types/datasource.ts b/packages/grafana-data/src/types/datasource.ts
index a239b84ed73..22b023f1cfe 100644
--- a/packages/grafana-data/src/types/datasource.ts
+++ b/packages/grafana-data/src/types/datasource.ts
@@ -423,16 +423,6 @@ export interface DataStreamState {
    */
   error?: DataQueryError;
 
-  /**
-   * @deprecated: DO NOT USE IN ANYTHING NEW!!!!
-   *
-   * merging streaming rows should be handled in the DataSource
-   * and/or we should add metadata to this state event that
-   * indicates that the PanelQueryRunner should manage the row
-   * additions.
-   */
-  delta?: DataFrame[];
-
   /**
    * Stop listening to this stream
    */