diff --git a/src/kernel/desktop-ths.c b/src/kernel/desktop-ths.c
index 3a9fc4c6..c7b06f2b 100644
--- a/src/kernel/desktop-ths.c
+++ b/src/kernel/desktop-ths.c
@@ -150,6 +150,9 @@ void* __kernel_desktop_main (void* data)
         return NULL;
     }
 
+    /* for threads mode, the idle handler for desktop thread is NULL */
+    __mg_dsk_msg_queue->OnIdle = NULL;
+
     /* init desktop window */
     init_desktop_win ();