diff --git a/plugins/charts/components/ChartMixin.js b/plugins/charts/components/ChartMixin.js
index 9c9cd519..4203a980 100644
--- a/plugins/charts/components/ChartMixin.js
+++ b/plugins/charts/components/ChartMixin.js
@@ -23,7 +23,7 @@ export default {
     },
     styles: {
       type: Object,
-      default: () => {}
+      default: () => { return {}; }
     },
     plugins: {
       type: Array,