diff --git a/src/models/order.model.ts b/src/models/order.model.ts
index 064c971..fd4cd51 100644
--- a/src/models/order.model.ts
+++ b/src/models/order.model.ts
@@ -43,7 +43,7 @@ const orderSchema = new Schema<OrderDocument>(
   {
     _id: {
       type: String,
-      default: uuidv4,
+      default: () => uuidv4(),
     },
     userId: {
       type: String,
diff --git a/src/models/product.model.ts b/src/models/product.model.ts
index 1621642..7558208 100644
--- a/src/models/product.model.ts
+++ b/src/models/product.model.ts
@@ -14,7 +14,7 @@ const productSchema = new Schema<ProductDocument>(
   {
     _id: {
       type: String,
-      default: uuidv4,
+      default: () => uuidv4(),
     },
     name: {
       type: String,
diff --git a/src/models/user.model.ts b/src/models/user.model.ts
index 30baf97..022bcc0 100644
--- a/src/models/user.model.ts
+++ b/src/models/user.model.ts
@@ -16,7 +16,7 @@ const userSchema = new Schema<UserDocument>(
   {
     _id: {
       type: String,
-      default: uuidv4,
+      default: () => uuidv4(),
     },
     email: {
       type: String,