diff --git a/src/js/charts/BaseChart.js b/src/js/charts/BaseChart.js
index dd500b5..8d862dc 100644
--- a/src/js/charts/BaseChart.js
+++ b/src/js/charts/BaseChart.js
@@ -92,8 +92,8 @@ export default class BaseChart {
 		this.configure(options);
 	}
 
-	prepareData(data, config) {
-		return data, config;
+	prepareData(data) {
+		return data;
 	}
 
 	prepareFirstData(data) {