diff --git a/class/cdc/usbh_cdc_ncm.c b/class/cdc/usbh_cdc_ncm.c
index f8cc03f3..f6e43af3 100644
--- a/class/cdc/usbh_cdc_ncm.c
+++ b/class/cdc/usbh_cdc_ncm.c
@@ -23,14 +23,6 @@
 
 #define CONFIG_USBHOST_CDC_NCM_ETH_MAX_SEGSZE 1514U
 
-/* eth rx size must be a multiple of 512 or 64 */
-#ifndef CONFIG_USBHOST_CDC_NCM_ETH_MAX_RX_SIZE
-#define CONFIG_USBHOST_CDC_NCM_ETH_MAX_RX_SIZE (2048)
-#endif
-#ifndef CONFIG_USBHOST_CDC_NCM_ETH_MAX_TX_SIZE
-#define CONFIG_USBHOST_CDC_NCM_ETH_MAX_TX_SIZE (2048)
-#endif
-
 static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_cdc_ncm_rx_buffer[CONFIG_USBHOST_CDC_NCM_ETH_MAX_RX_SIZE];
 static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_cdc_ncm_tx_buffer[CONFIG_USBHOST_CDC_NCM_ETH_MAX_TX_SIZE];
 static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_cdc_ncm_inttx_buffer[16];
diff --git a/class/vendor/net/usbh_rtl8152.c b/class/vendor/net/usbh_rtl8152.c
index 3711c751..8def54fb 100644
--- a/class/vendor/net/usbh_rtl8152.c
+++ b/class/vendor/net/usbh_rtl8152.c
@@ -12,13 +12,6 @@
 
 #define DEV_FORMAT "/dev/rtl8152"
 
-#ifndef CONFIG_USBHOST_RTL8152_ETH_MAX_RX_SIZE
-#define CONFIG_USBHOST_RTL8152_ETH_MAX_RX_SIZE (16*1024)
-#endif
-#ifndef CONFIG_USBHOST_RTL8152_ETH_MAX_TX_SIZE
-#define CONFIG_USBHOST_RTL8152_ETH_MAX_TX_SIZE (2048)
-#endif
-
 static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_rtl8152_rx_buffer[CONFIG_USBHOST_RTL8152_ETH_MAX_RX_SIZE];
 static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_rtl8152_tx_buffer[CONFIG_USBHOST_RTL8152_ETH_MAX_TX_SIZE];
 static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_rtl8152_inttx_buffer[2];
diff --git a/class/wireless/usbh_rndis.c b/class/wireless/usbh_rndis.c
index b1ca36cf..ab99855d 100644
--- a/class/wireless/usbh_rndis.c
+++ b/class/wireless/usbh_rndis.c
@@ -18,14 +18,6 @@ USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_rndis_buf[4096];
 #define CONFIG_USBHOST_RNDIS_ETH_MAX_FRAME_SIZE 1514
 #define CONFIG_USBHOST_RNDIS_ETH_MSG_SIZE       (CONFIG_USBHOST_RNDIS_ETH_MAX_FRAME_SIZE + 44)
 
-/* eth rx size must be a multiple of 512 or 64 */
-#ifndef CONFIG_USBHOST_RNDIS_ETH_MAX_RX_SIZE
-#define CONFIG_USBHOST_RNDIS_ETH_MAX_RX_SIZE (2048)
-#endif
-#ifndef CONFIG_USBHOST_RNDIS_ETH_MAX_TX_SIZE
-#define CONFIG_USBHOST_RNDIS_ETH_MAX_TX_SIZE (2048)
-#endif
-
 static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_rndis_rx_buffer[CONFIG_USBHOST_RNDIS_ETH_MAX_RX_SIZE];
 static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_rndis_tx_buffer[CONFIG_USBHOST_RNDIS_ETH_MAX_TX_SIZE];
 // static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_rndis_inttx_buffer[16];
diff --git a/core/usbd_core.c b/core/usbd_core.c
index 042b72e0..05152fa0 100644
--- a/core/usbd_core.c
+++ b/core/usbd_core.c
@@ -18,10 +18,6 @@
 #define INTF_DESC_bInterfaceNumber  2 /** Interface number offset */
 #define INTF_DESC_bAlternateSetting 3 /** Alternate setting offset */
 
-#ifndef CONFIG_USBDEV_STRING_LANGID
-#define CONFIG_USBDEV_STRING_LANGID 0x0409
-#endif
-
 struct usbd_tx_rx_msg {
     uint8_t ep;
     uint8_t ep_mult;