diff --git a/src/index.ts b/src/index.ts
index 33e8bc9..9772e61 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -157,9 +157,7 @@ export default class Config {
 
       switch (value) {
         case Array.isArray(value):
-          let newVal = this.array(key) ?? [];
-          newVal.push(value);
-          this.set(key, newVal);
+          this.set(key, [...(this.array(key) ?? []), ...value]);
           break;
         default:
           this.set(key, value);