diff --git a/radio/src/targets/common/arm/stm32/usbd_conf.h b/radio/src/targets/common/arm/stm32/usbd_conf.h
index 152b73a69..28e830242 100644
--- a/radio/src/targets/common/arm/stm32/usbd_conf.h
+++ b/radio/src/targets/common/arm/stm32/usbd_conf.h
@@ -59,8 +59,8 @@
 #define CDC_DATA_MAX_PACKET_SIZE     64   /* Endpoint IN & OUT Packet size */
 #define CDC_CMD_PACKET_SZE           8    /* Control Endpoint Packet size */
 
-#define CDC_IN_FRAME_INTERVAL        5    /* Number of frames between IN transfers */
-#define APP_RX_DATA_SIZE             512 // USB serial port output buffer. TODO: tune this buffer size /* Total size of IN buffer: APP_RX_DATA_SIZE*8/MAX_BAUDARATE*1000 should be > CDC_IN_FRAME_INTERVAL */
+#define CDC_IN_FRAME_INTERVAL        4    /* Number of frames between IN transfers */
+#define APP_RX_DATA_SIZE             512  /* Total size of IN buffer: APP_RX_DATA_SIZE*8/MAX_BAUDARATE*1000 should be > CDC_IN_FRAME_INTERVAL */
 #define APP_FOPS                     VCP_fops
 
 #endif // _USBD_CONF_H_