diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index fc692f1a65d2b..1a91f7aa7e601 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -671,7 +671,7 @@ export function concatenate<T>(array1: readonly T[] | undefined, array2: readonl
 export function concatenate<T>(array1: readonly T[] | undefined, array2: readonly T[] | undefined): readonly T[] | undefined {
     if (array2 === undefined || array2.length === 0) return array1;
     if (array1 === undefined || array1.length === 0) return array2;
-    return [...array1, ...array2];
+    return array1.concat(array2);
 }
 
 function selectIndex(_: unknown, i: number) {