diff --git a/src/line-chart.js b/src/line-chart.js
index 7795bf3e..4a7a50ce 100644
--- a/src/line-chart.js
+++ b/src/line-chart.js
@@ -41,8 +41,9 @@ class LineChart extends AbstractChart {
           }
 
           onDataPointClick({
+            index: i,
             value: x,
-            dataset,
+            dataset,            
             getColor: opacity => this.getColor(dataset, opacity)
           })
         }