1 files changed, 2 insertions, 2 deletions
diff --git a/src/fields/NumberField.ts b/src/fields/NumberField.ts
index ce07a18b8..f31be0c25 100644
--- a/src/fields/NumberField.ts
+++ b/src/fields/NumberField.ts
@@ -16,9 +16,9 @@ export class NumberField extends BasicField<number> {
         return new NumberField(this.Data);
     }
 
-    ToJson(): { _id: ObjectID, type: Types, data: number } {
+    ToJson(): { _id: String, type: Types, data: number } {
         return {
-            _id: new ObjectID(this.Id),
+            _id: this.Id,
             type: Types.Number,
             data: this.Data
         }