diff --git a/backend/src/core/entities/order/order.py b/backend/src/core/entities/order/order.py
index c318a0c..c4ada6b 100644
--- a/backend/src/core/entities/order/order.py
+++ b/backend/src/core/entities/order/order.py
@@ -123,11 +123,8 @@ class OrderCreated(BaseModel):
     )
 
 class OrderSummary(BaseModel):
-    id: Optional[ObjectIdStr] = Field(
-        ...,
-        default_factory=ObjectIdStr,
-        alias="_id",
-        description="Unique identifier of order"
+    id: str = Field(
+        ...
     )
     price: float = Field(
         default=None,
diff --git a/backend/src/core/services/order_service/order_service.py b/backend/src/core/services/order_service/order_service.py
index b101282..1dc813f 100644
--- a/backend/src/core/services/order_service/order_service.py
+++ b/backend/src/core/services/order_service/order_service.py
@@ -86,7 +86,7 @@ async def get_paginated_orders_for_client(
                 [objectId_to_str(tool) for tool in order.tools])
 
             orders.append(OrderSummary(
-                id=order.id,
+                id=str(order.id),
                 price=order.price,
                 tools=tool_summaries,
                 start_leasing=order.start_leasing,