diff --git a/protocol/serial_uart.c b/protocol/serial_uart.c
index 6c0af881..600340cd 100644
--- a/protocol/serial_uart.c
+++ b/protocol/serial_uart.c
@@ -47,7 +47,7 @@ void serial_init(void)
 }
 
 // RX ring buffer
-#define RBUF_SIZE   8
+#define RBUF_SIZE   256
 static uint8_t rbuf[RBUF_SIZE];
 static uint8_t rbuf_head = 0;
 static uint8_t rbuf_tail = 0;