diff --git a/src/core/order-coordinator.ts b/src/core/order-coordinator.ts
index dd323a8..da0aea0 100644
--- a/src/core/order-coordinator.ts
+++ b/src/core/order-coordinator.ts
@@ -353,7 +353,8 @@ export async function marketClose(
     symbol,
     side,
     type,
-    closePosition: "true",
+    quantity,
+    reduceOnly: "true",
   };
   
   await deduplicateOrders(adapter, symbol, openOrders, locks, timers, pendings, type, side, log);