diff --git a/src/generic/usb_cdc.c b/src/generic/usb_cdc.c
index 04b02da0..dfc88511 100644
--- a/src/generic/usb_cdc.c
+++ b/src/generic/usb_cdc.c
@@ -6,12 +6,13 @@
 
 #include <string.h> // memmove
 #include "board/pgm.h" // PROGMEM
-#include "board/usb_cdc.h" // usb_notify_setup
+#include "board/usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
 #include "byteorder.h" // cpu_to_le16
 #include "command.h" // output
 #include "generic/usbstd.h" // struct usb_device_descriptor
 #include "generic/usbstd_cdc.h" // struct usb_cdc_header_descriptor
 #include "sched.h" // sched_wake_task
+#include "usb_cdc.h" // usb_notify_setup
 
 // XXX - move to Kconfig
 #define CONFIG_USB_VENDOR_ID 0x2341
diff --git a/src/generic/usb_cdc.h b/src/generic/usb_cdc.h
index c5450bfa..2e63b7a3 100644
--- a/src/generic/usb_cdc.h
+++ b/src/generic/usb_cdc.h
@@ -3,17 +3,11 @@
 
 #include <stdint.h> // uint_fast8_t
 
+// endpoint sizes
 enum {
     USB_CDC_EP0_SIZE = 16,
-
-    // XXX - endpoint ids may need to changed per-board
-    USB_CDC_EP_ACM = 1,
     USB_CDC_EP_ACM_SIZE = 8,
-
-    USB_CDC_EP_BULK_OUT = 2,
     USB_CDC_EP_BULK_OUT_SIZE = 64,
-
-    USB_CDC_EP_BULK_IN = 5,
     USB_CDC_EP_BULK_IN_SIZE = 64,
 };
 
diff --git a/src/generic/usb_cdc_ep.h b/src/generic/usb_cdc_ep.h
new file mode 100644
index 00000000..1ca97a79
--- /dev/null
+++ b/src/generic/usb_cdc_ep.h
@@ -0,0 +1,11 @@
+#ifndef __GENERIC_USB_CDC_EP_H
+#define __GENERIC_USB_CDC_EP_H
+
+// Default USB endpoint ids
+enum {
+    USB_CDC_EP_ACM = 1,
+    USB_CDC_EP_BULK_OUT = 2,
+    USB_CDC_EP_BULK_IN = 3,
+};
+
+#endif // usb_cdc_ep.h
diff --git a/src/lpc176x/usb_cdc_ep.h b/src/lpc176x/usb_cdc_ep.h
new file mode 100644
index 00000000..d657f3c2
--- /dev/null
+++ b/src/lpc176x/usb_cdc_ep.h
@@ -0,0 +1,10 @@
+#ifndef __LPC176X_USB_CDC_EP_H
+#define __LPC176X_USB_CDC_EP_H
+
+enum {
+    USB_CDC_EP_ACM = 1,
+    USB_CDC_EP_BULK_OUT = 2,
+    USB_CDC_EP_BULK_IN = 5,
+};
+
+#endif // usb_cdc_ep.h
diff --git a/src/lpc176x/usbserial.c b/src/lpc176x/usbserial.c
index 28c0881f..2b6dca00 100644
--- a/src/lpc176x/usbserial.c
+++ b/src/lpc176x/usbserial.c
@@ -6,11 +6,12 @@
 
 #include <string.h> // memcpy
 #include "LPC17xx.h" // LPC_SC
-#include "board/usb_cdc.h" // usb_notify_setup
 #include "byteorder.h" // cpu_to_le32
 #include "command.h" // output
+#include "generic/usb_cdc.h" // usb_notify_setup
 #include "internal.h" // gpio_peripheral
 #include "sched.h" // DECL_INIT
+#include "usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
 
 // Internal endpoint addresses
 #define EP0OUT 0x00