diff --git a/src/rs232.c b/src/rs232.c
index afaec69..edf36ad 100644
--- a/src/rs232.c
+++ b/src/rs232.c
@@ -89,7 +89,7 @@ serial_port rs232_open(const char* pcPortName)
     return INVALID_SERIAL_PORT;
   }
 
-  tcflush(sp, TCIFLUSH);
+  tcflush(sp->fd, TCIFLUSH);
   return sp;
 }