diff --git a/MtApi5/MtApi5Client.cs b/MtApi5/MtApi5Client.cs
index 33bf084b..69482ad0 100755
--- a/MtApi5/MtApi5Client.cs
+++ b/MtApi5/MtApi5Client.cs
@@ -497,9 +497,10 @@ namespace MtApi5
         ///Closes a position with the specified ticket.
         ///</summary>
         ///<param name="ticket">Ticket of the closed position.</param>
-        public bool PositionClose(int ticket)
+        ///<param name="deviation">Maximal deviation from the current price (in points).</param>
+        public bool PositionClose(ulong ticket, ulong deviation = ulong.MaxValue)
         {
-            var commandParameters = new ArrayList { ticket};
+            var commandParameters = new ArrayList { ticket, deviation };
 
             return SendCommand<bool>(Mt5CommandType.PositionClose, commandParameters);
         }
diff --git a/mq5/MtApi5.mq5 b/mq5/MtApi5.mq5
index bc4e935a..b213a58e 100755
--- a/mq5/MtApi5.mq5
+++ b/mq5/MtApi5.mq5
@@ -279,12 +279,14 @@ int executeCommand()
 
    case 64: //PositionClose
    {      
-      int ticket;
+      ulong ticket;
+      ulong deviation;
       CTrade trade;
-
-      getIntValue(ExpertHandle, 0, ticket);      
-             
-      sendBooleanResponse(ExpertHandle, trade.PositionClose(ticket));
+      
+      getULongValue(ExpertHandle, 0, ticket);
+      getULongValue(ExpertHandle, 1, deviation);
+      
+      sendBooleanResponse(ExpertHandle, trade.PositionClose(ticket, deviation));
    }
    break;