diff --git a/src/RS232_win.c b/src/RS232_win.c
--- a/src/RS232_win.c
+++ b/src/RS232_win.c
@@ -149,6 +149,7 @@ rs232portslist_t* rs232getportlist()  //
 			if(NULL!=previtem)previtem->next = item;
 			previtem = item;
 			if(NULL==firstitem)firstitem = item;
+			rs232close(devName);
 		}
 	}
 	return firstitem;