diff --git a/Drivers/NRF24L01.cpp b/Drivers/NRF24L01.cpp
index f5a660c7..fb9da6fe 100644
--- a/Drivers/NRF24L01.cpp
+++ b/Drivers/NRF24L01.cpp
@@ -820,7 +820,7 @@ uint NRF24L01::OnRead(Buffer& bs)
 // 向NRF的发送缓冲区中写入数据
 bool NRF24L01::SendTo(const Buffer& bs, const Buffer& addr)
 {
-	if(bs.Length()) return false;
+	if(!bs.Length()) return false;
 
 	TS("R24::SendTo");