diff --git a/src/RS232_win.c b/src/RS232_win.c
--- a/src/RS232_win.c
+++ b/src/RS232_win.c
@@ -120,10 +120,10 @@ rs232port_t rs232open(char* psPortName)
         rs232port_t fd;
         /* Char to Wchar conversion*/
         int neededSize = MultiByteToWideChar(CP_ACP, 0, psPortName, -1, 0, 0);
-        wchar_t* wcstr = new wchar_t[neededSize];
-        MultiByteToWideChar(CP_ACP, 0, charString, -1, wcstr, neededSize);
+        wchar_t* wcstr =  (wchar_t*)malloc(sizeof(wchar_t)*neededSize);
+        MultiByteToWideChar(CP_ACP, 0, psPortName, -1, wcstr, neededSize);
         fd = (rs232port_t)CreateFile(wcstr,GENERIC_READ | GENERIC_WRITE,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
-        delete wcstr;
+        free(wcstr);
 #ifdef RS232_debug
 		if(fd==(rs232port_t)INVALID_HANDLE_VALUE)
 		{