diff --git a/superset/assets/src/explore/controls.jsx b/superset/assets/src/explore/controls.jsx
index 353b24e45dcd..922b45c8357c 100644
--- a/superset/assets/src/explore/controls.jsx
+++ b/superset/assets/src/explore/controls.jsx
@@ -207,6 +207,7 @@ export const controls = {
     ...metrics,
     multi: true,
     label: t('Percentage Metrics'),
+    default: [],
     validators: [],
     description: t('Metrics for which percentage of total are to be displayed'),
   },