diff --git a/tmk_core/protocol/serial_soft.c b/tmk_core/protocol/serial_soft.c
index 569205bf..ab24b1f4 100644
--- a/tmk_core/protocol/serial_soft.c
+++ b/tmk_core/protocol/serial_soft.c
@@ -86,7 +86,9 @@ void serial_init(void)
 }
 
 /* RX ring buffer */
-#define RBUF_SIZE   8
+#ifndef RBUF_SIZE
+#define RBUF_SIZE   256
+#endif
 static uint8_t rbuf[RBUF_SIZE];
 static uint8_t rbuf_head = 0;
 static uint8_t rbuf_tail = 0;