diff --git a/src/cart/dto/cart.dto.ts b/src/cart/dto/cart.dto.ts
index 14fce1b..e855abd 100644
--- a/src/cart/dto/cart.dto.ts
+++ b/src/cart/dto/cart.dto.ts
@@ -20,6 +20,7 @@ export class DeleteItemInCartDto {
   productId: Types.ObjectId
 
   @ApiProperty({ example: 'EF20241212' })
+  @IsNotEmpty()
   sku: string
 
   customerId?: string