diff --git a/packages/grafana-data/src/vector/vectorToArray.ts b/packages/grafana-data/src/vector/vectorToArray.ts
index 34212651ab8..a0a17d71cb9 100644
--- a/packages/grafana-data/src/vector/vectorToArray.ts
+++ b/packages/grafana-data/src/vector/vectorToArray.ts
@@ -1,7 +1,7 @@
 import { Vector } from '../types/vector';
 
 export function vectorToArray<T>(v: Vector<T>): T[] {
-  const arr: T[] = [];
+  const arr: T[] = Array(v.length);
   for (let i = 0; i < v.length; i++) {
     arr[i] = v.get(i);
   }