diff --git a/superset-frontend/temporary_superset_ui/superset-ui/plugins/superset-ui-plugins/packages/superset-ui-preset-chart-xy/src/Line/Line.tsx b/superset-frontend/temporary_superset_ui/superset-ui/plugins/superset-ui-plugins/packages/superset-ui-preset-chart-xy/src/Line/Line.tsx
index ef0a35cdb104..37a70b396d8b 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/plugins/superset-ui-plugins/packages/superset-ui-preset-chart-xy/src/Line/Line.tsx
+++ b/superset-frontend/temporary_superset_ui/superset-ui/plugins/superset-ui-plugins/packages/superset-ui-preset-chart-xy/src/Line/Line.tsx
@@ -30,9 +30,7 @@ export interface TooltipProps {
   allSeries: Series[];
   datum: SeriesValue;
   series: {
-    [key: string]: {
-      y: number;
-    };
+    [key: string]: SeriesValue;
   };
   theme: typeof chartTheme;
 }
@@ -215,9 +213,7 @@ export default class LineChart extends PureComponent<Props> {
         }: {
           datum: SeriesValue;
           series: {
-            [key: string]: {
-              y: number;
-            };
+            [key: string]: SeriesValue;
           };
         }) => (
           <TooltipRenderer