diff --git a/packages/workflow/src/AugmentObject.ts b/packages/workflow/src/AugmentObject.ts
index 01e6f03ecb..708bfd8474 100644
--- a/packages/workflow/src/AugmentObject.ts
+++ b/packages/workflow/src/AugmentObject.ts
@@ -76,11 +76,11 @@ export function augmentObject<T extends object>(data: T): T {
 	if (augmentedObjects.has(data)) return data;
 
 	const newData = {} as IDataObject;
-	const deletedProperties: Array<string | symbol> = [];
+	const deletedProperties = new Set<string | symbol>();
 
 	const proxy = new Proxy(data, {
 		get(target, key: string, receiver): unknown {
-			if (deletedProperties.indexOf(key) !== -1) {
+			if (deletedProperties.has(key)) {
 				return undefined;
 			}
 
@@ -107,7 +107,7 @@ export function augmentObject<T extends object>(data: T): T {
 				delete newData[key];
 			}
 			if (key in target) {
-				deletedProperties.push(key);
+				deletedProperties.add(key);
 			}
 
 			return true;
@@ -118,34 +118,33 @@ export function augmentObject<T extends object>(data: T): T {
 					delete newData[key];
 				}
 				if (key in target) {
-					deletedProperties.push(key);
+					deletedProperties.add(key);
 				}
 				return true;
 			}
 
 			newData[key] = newValue as IDataObject;
 
-			const deleteIndex = deletedProperties.indexOf(key);
-			if (deleteIndex !== -1) {
-				deletedProperties.splice(deleteIndex, 1);
+			if (deletedProperties.has(key)) {
+				deletedProperties.delete(key);
 			}
 
 			return true;
 		},
 		has(target, key) {
-			if (deletedProperties.indexOf(key) !== -1) return false;
+			if (deletedProperties.has(key)) return false;
 			return Reflect.has(newData, key) || Reflect.has(target, key);
 		},
 		ownKeys(target) {
 			const originalKeys = Reflect.ownKeys(target);
 			const newKeys = Object.keys(newData);
 			return [...new Set([...originalKeys, ...newKeys])].filter(
-				(key) => deletedProperties.indexOf(key) === -1,
+				(key) => !deletedProperties.has(key),
 			);
 		},
 
 		getOwnPropertyDescriptor(target, key) {
-			if (deletedProperties.indexOf(key) !== -1) return undefined;
+			if (deletedProperties.has(key)) return undefined;
 			return Object.getOwnPropertyDescriptor(key in newData ? newData : data, key);
 		},
 	});