diff --git a/packages/runtime-core/src/helpers/renderList.ts b/packages/runtime-core/src/helpers/renderList.ts
index 1655d555fb3..a5453a4029c 100644
--- a/packages/runtime-core/src/helpers/renderList.ts
+++ b/packages/runtime-core/src/helpers/renderList.ts
@@ -56,19 +56,18 @@ export function renderList(
   cache?: any[],
   index?: number
 ): VNodeChild[] {
-  let ret: VNodeChild[]
+  let ret: VNodeChild[] = []
   const cached = (cache && cache[index!]) as VNode[] | undefined
 
   if (isArray(source) || isString(source)) {
-    ret = new Array(source.length)
-    for (let i = 0, l = source.length; i < l; i++) {
+    const len = source.length
+    for (let i = 0; i < len; i++) {
       ret[i] = renderItem(source[i], i, undefined, cached && cached[i])
     }
   } else if (typeof source === 'number') {
     if (__DEV__ && !Number.isInteger(source)) {
       warn(`The v-for range expect an integer value but got ${source}.`)
     }
-    ret = new Array(source)
     for (let i = 0; i < source; i++) {
       ret[i] = renderItem(i + 1, i, undefined, cached && cached[i])
     }
@@ -79,18 +78,16 @@ export function renderList(
       )
     } else {
       const keys = Object.keys(source)
-      ret = new Array(keys.length)
       for (let i = 0, l = keys.length; i < l; i++) {
         const key = keys[i]
         ret[i] = renderItem(source[key], key, i, cached && cached[i])
       }
     }
-  } else {
-    ret = []
   }
 
   if (cache) {
     cache[index!] = ret
   }
+  
   return ret
 }