diff --git a/platform/rtthread/usb_check.c b/platform/rtthread/usb_check.c
index 10302f4f..9b12f3f8 100644
--- a/platform/rtthread/usb_check.c
+++ b/platform/rtthread/usb_check.c
@@ -6,10 +6,6 @@
 #error must enable RT_USING_TIMER_SOFT to support timer callback in thread
 #endif
 
-#if IDLE_THREAD_STACK_SIZE < 2048
-#error "IDLE_THREAD_STACK_SIZE must be >= 2048"
-#endif
-
 #if RT_TIMER_THREAD_STACK_SIZE < 2048
 #error "RT_TIMER_THREAD_STACK_SIZE must be >= 2048"
 #endif