diff --git a/ui/src/shared/components/DygraphLegend.js b/ui/src/shared/components/DygraphLegend.js
index 2366aad5e..8a986bc81 100644
--- a/ui/src/shared/components/DygraphLegend.js
+++ b/ui/src/shared/components/DygraphLegend.js
@@ -29,7 +29,7 @@ const DygraphLegend = ({
   isFilterVisible,
   onToggleFilter,
 }) => {
-  const withValues = series.filter(s => s.y)
+  const withValues = series.filter(s => s.y >= 0 || s.y <= 0)
   const sorted = _.sortBy(
     withValues,
     ({y, label}) => (sortType === 'numeric' ? y : label)