diff --git a/src/BarChart.tsx b/src/BarChart.tsx
index b1787f23..4e8aa27b 100644
--- a/src/BarChart.tsx
+++ b/src/BarChart.tsx
@@ -142,7 +142,7 @@ class BarChart extends AbstractChart<BarChartProps, BarChartState> {
     flatColor: boolean;
   }) => {
     return data.map((dataset, index) => (
-      <Defs key={Math.random()}>
+      <Defs key={dataset.key ?? index}>
         {dataset.colors?.map((color, colorIndex) => {
           const highOpacityColor = color(1.0);
           const lowOpacityColor = color(0.1);
diff --git a/src/HelperTypes.ts b/src/HelperTypes.ts
index b4992023..8a50c40b 100644
--- a/src/HelperTypes.ts
+++ b/src/HelperTypes.ts
@@ -19,6 +19,9 @@ export interface Dataset {
 
   /** Override of LineChart's withScrollableDot property just for this dataset */
   withScrollableDot?: boolean;
+
+  /** Unique key **/
+  key?: string | number;
 }
 
 export interface ChartData {