diff --git a/protocol/ps2.c b/protocol/ps2.c
index cf7b1f43c..ed4560910 100644
--- a/protocol/ps2.c
+++ b/protocol/ps2.c
@@ -181,7 +181,7 @@ uint8_t ps2_host_recv(void)
 }
 #else
 /* ring buffer to store ps/2 key data */
-#define PBUF_SIZE 8
+#define PBUF_SIZE 32
 static uint8_t pbuf[PBUF_SIZE];
 static uint8_t pbuf_head = 0;
 static uint8_t pbuf_tail = 0;
diff --git a/protocol/ps2_usart.c b/protocol/ps2_usart.c
index 7d591c650..9ea6b7786 100644
--- a/protocol/ps2_usart.c
+++ b/protocol/ps2_usart.c
@@ -287,7 +287,7 @@ static inline void inhibit(void)
 /*--------------------------------------------------------------------
  * Ring buffer to store scan codes from keyboard
  *------------------------------------------------------------------*/
-#define PBUF_SIZE 8
+#define PBUF_SIZE 32
 static uint8_t pbuf[PBUF_SIZE];
 static uint8_t pbuf_head = 0;
 static uint8_t pbuf_tail = 0;