diff --git a/packages/grafana-ui/src/components/uPlot/plugins/TooltipPlugin2.tsx b/packages/grafana-ui/src/components/uPlot/plugins/TooltipPlugin2.tsx
index c93e7081ea3..174699eec39 100644
--- a/packages/grafana-ui/src/components/uPlot/plugins/TooltipPlugin2.tsx
+++ b/packages/grafana-ui/src/components/uPlot/plugins/TooltipPlugin2.tsx
@@ -574,7 +574,7 @@ const getStyles = (theme: GrafanaTheme2, maxWidth?: number, maxHeight?: number)
   tooltipWrapper: css({
     top: 0,
     left: 0,
-    zIndex: theme.zIndex.tooltip,
+    zIndex: theme.zIndex.portal,
     whiteSpace: 'pre',
     borderRadius: theme.shape.radius.default,
     position: 'fixed',