diff --git a/components/finsh/shell.c b/components/finsh/shell.c
index ad3b49534d..125dcec198 100644
--- a/components/finsh/shell.c
+++ b/components/finsh/shell.c
@@ -113,7 +113,8 @@ void finsh_set_device(const char* device_name)
     /* check whether it's a same device */
     if (dev == shell->device) return;
     /* open this device and set the new device in finsh shell */
-    if (rt_device_open(dev, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX) == RT_EOK)
+    if (rt_device_open(dev, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX |\
+                       RT_DEVICE_FLAG_STREAM) == RT_EOK)
     {
         if (shell->device != RT_NULL)
         {
diff --git a/src/kservice.c b/src/kservice.c
index 12878e67d1..fef284e8af 100644
--- a/src/kservice.c
+++ b/src/kservice.c
@@ -1114,11 +1114,11 @@ void rt_kprintf(const char *fmt, ...)
     }
     else
     {
-        rt_uint16_t old_flag = _console_device->flag;
+        rt_uint16_t old_flag = _console_device->open_flag;
 
-        _console_device->flag |= RT_DEVICE_FLAG_STREAM;
+        _console_device->open_flag |= RT_DEVICE_FLAG_STREAM;
         rt_device_write(_console_device, 0, rt_log_buf, length);
-        _console_device->flag = old_flag;
+        _console_device->open_flag = old_flag;
     }
 #else
     rt_hw_console_output(rt_log_buf);